
Grilling large mushrooms on the barbecue is a fantastic way to elevate your outdoor cooking game, offering a hearty, meat-like texture and rich, smoky flavor that complements any meal. Whether you’re using portobello, shiitake, or other substantial varieties, the key to success lies in proper preparation and technique. Start by cleaning the mushrooms gently to remove dirt, then marinate them in a flavorful mixture of olive oil, garlic, herbs, and spices to enhance their natural umami taste. Preheat your barbecue to medium heat, ensuring the grill grates are clean and lightly oiled to prevent sticking. Place the mushrooms cap-side down to create beautiful grill marks and allow them to cook evenly, flipping halfway through to ensure both sides are tender and caramelized. With a little patience and the right approach, you’ll achieve juicy, perfectly grilled mushrooms that are sure to impress at your next barbecue.
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What You'll Learn
- Prepping Mushrooms: Clean, trim stems, and brush olive oil for even cooking and flavor absorption
- Marinating Tips: Use garlic, herbs, and balsamic vinegar for 30 minutes to enhance taste
- Grill Setup: Preheat to medium-high, use a grill basket or skewers to prevent falling
- Cooking Time: Grill 5-7 minutes per side until tender and slightly charred for best texture
- Serving Ideas: Pair with herbs, cheese, or as a burger topping for a hearty meal

Prepping Mushrooms: Clean, trim stems, and brush olive oil for even cooking and flavor absorption
When preparing large mushrooms for the barbecue, the first step is to clean them properly. Mushrooms are delicate and can absorb water, so avoid submerging them. Instead, use a damp paper towel or a soft brush to gently wipe away any dirt or debris from the caps and stems. If there are stubborn spots, you can quickly rinse them under cold water, but be sure to pat them dry immediately with a clean towel. This ensures that the mushrooms remain firm and don’t become waterlogged, which can affect their texture during cooking.
After cleaning, the next step is to trim the stems. For large mushrooms like portobellos or large creminis, the stems can be tough and woody, especially toward the base. Use a small knife to carefully trim off the bottom portion of the stem, leaving about half an inch attached to the cap. This not only improves the texture but also creates a neat base for the mushroom to sit flat on the grill. If you’re stuffing the mushrooms, you can finely chop the trimmed stems and use them as part of the filling to reduce waste.
Once the mushrooms are clean and trimmed, brushing them with olive oil is essential for even cooking and flavor absorption. Olive oil acts as a barrier, preventing the mushrooms from sticking to the grill grates while also helping them cook evenly. Use a pastry brush to apply a generous but even coat of olive oil to both the caps and the gills (the underside of the mushroom). This step also enhances the natural earthy flavor of the mushrooms and allows any seasonings or marinades to adhere better.
For added flavor, consider seasoning the mushrooms after brushing them with olive oil. A simple mix of salt, pepper, garlic powder, and a sprinkle of smoked paprika works well for barbecue mushrooms. If you prefer a more herbaceous profile, you can add dried or fresh herbs like thyme, rosemary, or oregano. The olive oil will help these seasonings penetrate the mushrooms, ensuring every bite is packed with flavor. Allow the mushrooms to sit for a few minutes after seasoning to let the flavors meld before placing them on the grill.
Finally, the prepped mushrooms are ready for the barbecue. The olive oil coating ensures they won’t dry out or burn, while the trimmed stems allow them to sit steadily on the grill. Whether you’re grilling them whole, slicing them for skewers, or using them as burger buns, this prepping process—cleaning, trimming, and oiling—sets the foundation for perfectly cooked, flavorful mushrooms that will be a standout addition to your barbecue spread.
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Marinating Tips: Use garlic, herbs, and balsamic vinegar for 30 minutes to enhance taste
When preparing big mushrooms for the barbecue, marinating is a crucial step to infuse them with deep, rich flavors. A simple yet effective marinade combines garlic, herbs, and balsamic vinegar, which works wonders in just 30 minutes. Start by mincing 2-3 cloves of garlic to release its aromatic oils, ensuring every bite of the mushroom is packed with its savory essence. Garlic not only adds a bold flavor but also complements the earthy taste of the mushrooms perfectly.
Next, incorporate fresh herbs like thyme, rosemary, or oregano into the marinade. These herbs bring a fragrant, slightly woody or citrusy note that balances the richness of the mushrooms. If fresh herbs aren't available, dried versions can be used, though fresh herbs tend to impart a brighter flavor. Chop the herbs finely and add them to the garlic. The combination of garlic and herbs creates a robust base that enhances the mushroom's natural umami.
Balsamic vinegar is the secret weapon in this marinade, adding a tangy, slightly sweet depth that caramelizes beautifully on the barbecue. Use about 2-3 tablespoons of balsamic vinegar, adjusting based on the size of your mushrooms. The acidity of the vinegar also helps tenderize the mushrooms slightly, making them more receptive to the flavors. Mix the garlic, herbs, and balsamic vinegar with 2-3 tablespoons of olive oil to create a cohesive marinade that clings well to the mushrooms.
To marinate, clean the big mushrooms by gently brushing off any dirt and removing the stems if desired. Place them in a shallow dish or a resealable bag, then pour the marinade over them, ensuring each mushroom is well-coated. Let them sit at room temperature for 30 minutes, flipping them halfway through to evenly distribute the flavors. This short marinating time is sufficient to enhance the taste without overpowering the mushrooms' natural character.
Finally, when grilling, the marinade will create a delicious crust as the balsamic vinegar caramelizes. Brush the mushrooms with any remaining marinade before placing them on the barbecue over medium heat. Cook for 5-7 minutes on each side, until they are tender and slightly charred. The garlic, herbs, and balsamic vinegar will have transformed these big mushrooms into a flavorful, juicy side or centerpiece for your barbecue spread.
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Grill Setup: Preheat to medium-high, use a grill basket or skewers to prevent falling
When preparing to grill big mushrooms, the first step in your grill setup is to preheat your barbecue to medium-high heat. This temperature range, typically around 375°F to 450°F (190°C to 230°C), is ideal for cooking mushrooms evenly without drying them out. Preheating ensures that the grill grates are hot enough to create a nice sear on the mushrooms, enhancing their flavor and texture. Allow the grill to heat for at least 10–15 minutes to stabilize the temperature before adding your mushrooms.
Once your grill is preheated, consider how you’ll place the mushrooms on the grates. Big mushrooms, such as portobellos or large cremini, can be delicate and prone to falling apart. To prevent this, use a grill basket or skewers. A grill basket is particularly useful because it holds the mushrooms securely while allowing them to cook evenly and drain excess moisture. If using skewers, thread the mushrooms carefully, ensuring they are stable and won’t slip off during grilling. Both methods help maintain the mushrooms’ shape and make flipping them easier.
If you opt for a grill basket, lightly coat it with oil or cooking spray to prevent sticking. Place the mushrooms inside the basket, ensuring they are in a single layer for even cooking. For skewers, choose sturdy metal or pre-soaked wooden ones to avoid burning. Thread the mushrooms through their stems or caps, depending on their size, and brush them lightly with oil to enhance browning. Both tools elevate the mushrooms slightly above the grates, reducing the risk of them falling through or sticking.
Position the grill basket or skewers directly over the medium-high heat zone of the grill. Close the lid to trap the heat and cook the mushrooms for 3–5 minutes on each side, depending on their thickness. The lid helps create an oven-like environment, ensuring the mushrooms cook through while developing a smoky flavor. Keep a close eye on them to avoid overcooking, as mushrooms can release moisture quickly and become soggy if left too long.
Finally, once the mushrooms are tender and have grill marks, remove them from the heat. Let them rest for a minute before serving to allow the juices to redistribute. Using a grill basket or skewers not only prevents the mushrooms from falling apart but also makes the grilling process more manageable and efficient. With the right setup, you’ll achieve perfectly grilled big mushrooms that are flavorful, juicy, and intact.
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Cooking Time: Grill 5-7 minutes per side until tender and slightly charred for best texture
When grilling large mushrooms on the barbecue, achieving the perfect texture is all about mastering the cooking time. Aim to grill the mushrooms for 5-7 minutes per side, ensuring they become tender and develop a slightly charred exterior. This timeframe allows the mushrooms to cook through without drying out, while the char adds a smoky depth of flavor that complements their earthy taste. Preheat your grill to medium-high heat (around 375°F to 400°F) before placing the mushrooms on the grates to ensure even cooking.
To prepare the mushrooms for grilling, clean them gently with a damp cloth or brush to remove any dirt, and trim the stems slightly for stability. Brush both sides generously with olive oil or melted butter to prevent sticking and enhance browning. Season with salt, pepper, and your choice of herbs or spices, such as garlic powder, thyme, or paprika, to elevate their flavor. Place the mushrooms gill-side up on the grill first, as this side will take longer to cook and allows the oil or butter to seep into the crevices.
After 5-7 minutes, carefully flip the mushrooms using a spatula to avoid breaking them. Grill the other side for an additional 5-7 minutes, keeping a close eye to ensure they don’t overcook. The mushrooms are ready when they feel tender when pierced with a fork and have visible grill marks. If you’re stuffing the mushrooms, add the filling after the first side has cooked and allow the stuffing to heat through during the final minutes of grilling.
For the best texture, avoid overcrowding the grill, as this can trap steam and prevent proper charring. If your mushrooms are particularly large or thick, you may need to add a minute or two to the cooking time. Conversely, smaller portobellos or stuffed mushrooms may cook slightly faster, so adjust the time accordingly. Always trust your judgment and use the tenderness and appearance as your primary indicators of doneness.
Once the mushrooms are grilled to perfection, remove them from the heat and let them rest for a minute or two before serving. This allows the juices to redistribute, ensuring a moist and flavorful bite. Whether served as a main dish, side, or topping for burgers, these grilled mushrooms will have a delightful contrast of tender interiors and slightly charred exteriors, making them a standout addition to your barbecue spread.
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Serving Ideas: Pair with herbs, cheese, or as a burger topping for a hearty meal
When grilling large mushrooms on the barbecue, consider pairing them with fresh herbs to elevate their earthy flavor. Start by brushing the mushrooms with olive oil and seasoning them with salt, pepper, and a sprinkle of chopped thyme or rosemary. After grilling until tender, top each mushroom with a mixture of finely chopped parsley, basil, or chives for a burst of freshness. This combination not only enhances the mushroom’s natural taste but also adds a vibrant, aromatic touch to your dish. Serve them as a side or a standalone appetizer for a light yet satisfying option.
For a richer, more indulgent serving idea, incorporate cheese into your grilled mushrooms. After removing the mushrooms from the barbecue, stuff their caps with a mixture of softened goat cheese, grated Parmesan, or crumbled blue cheese. Return them to the grill for a few minutes to allow the cheese to melt and slightly brown. Alternatively, sprinkle shredded mozzarella or cheddar over the mushrooms and let it melt under the grill’s heat. Pair these cheesy mushrooms with a crisp green salad or crusty bread for a hearty and comforting meal.
Grilled large mushrooms also make an excellent burger topping, adding a meaty texture and umami flavor to your sandwich. After grilling the mushrooms, slice them and layer them on top of your burger patty along with lettuce, tomato, and a drizzle of garlic aioli or balsamic glaze. The mushrooms’ smoky flavor complements the beef or plant-based patty perfectly, creating a satisfying and flavorful burger. This option is ideal for those looking to add a vegetarian-friendly element to their barbecue spread.
Another creative serving idea is to pair grilled mushrooms with a herb-infused compound butter. While the mushrooms are on the barbecue, mix softened butter with minced garlic, chopped tarragon, and a pinch of lemon zest. Once the mushrooms are grilled to perfection, top them with a dollop of this flavored butter, allowing it to melt and coat the mushrooms. The creamy, herb-infused butter adds a luxurious finish, making this dish perfect for a special outdoor meal. Serve with grilled vegetables or a grain salad for a well-rounded plate.
Finally, consider using grilled large mushrooms as the centerpiece of a vegetarian platter. Arrange the mushrooms alongside other grilled vegetables like zucchini, bell peppers, and eggplant. Drizzle everything with a tangy balsamic reduction and sprinkle with fresh herbs. This presentation not only looks impressive but also offers a variety of flavors and textures. Add a side of crusty bread or a scoop of quinoa for a filling, plant-based meal that’s both nutritious and satisfying. Whether for a family dinner or a gathering with friends, this serving idea is sure to impress.
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Frequently asked questions
Large, firm mushrooms like portobello, shiitake, or king oyster work best as they hold up well to heat and develop a rich, meaty texture.
Clean the mushrooms with a damp cloth or brush to remove dirt. Remove the stems (if using portobello), brush with oil, and season with salt, pepper, and your choice of herbs or spices.
Marinating mushrooms for 15–30 minutes in a mixture of olive oil, garlic, herbs, and acid (like balsamic vinegar or lemon juice) enhances their flavor and helps them caramelize on the grill.
Grill mushrooms for 4–6 minutes per side over medium heat. They’re done when they’re tender, slightly charred, and release their juices.
Large mushrooms like portobello can be grilled directly on the grates. Smaller varieties or sliced mushrooms should be placed in a grill basket or on foil to prevent them from falling through the cracks.

























