Published 5/22/2023 • Updated 10/4/2023
The BEST Portobello Mushroom Burger Recipe
Even the biggest meat-heads out there will love these meatless burgers! The secret is the marinade for the mushrooms. It gives this precious fungus a meaty, savory flavor that is sure to make your mouth water. And, of course, nothing goes with a burger quite like some tasty toppings! We kept it simple yet delicious with some red onions, pepper jack cheese, and a sauce made of ketchup and garlic hummus. But feel free to get creative and add your favorite toppings!
Featured Ingredients
Portobello mushrooms: use large mushrooms as they have a great earthy flavor and are just about burger patty size! Red onion: we used red onion as the burger topping for this recipe, but feel free to use your favorite burger toppings! Pepper jack cheese: a great melty cheese to go on top of the mushrooms. You can also use your favorite vegan cheese! Chopped greens: any kind will do. We recommend arugula, spinach, romaine, etc. Onion burger buns: we love the flavor that onion buns bring to the table! Use any kind of hamburger buns you like, though. Garlic hummus: you could get plain ol’ hummus, but garlic makes everything better! Ketchup: adds a layer of sweetness and tang that balances this burger out perfectly.
What’s In Our Homemade Mushroom Marinade?
Our grilled portobello mushroom marinade is quick, easy, and absolutely delicious! It’s the secret sauce to making these portobello mushroom burgers taste like the real deal. Here’s what’s in ’em: A super quick and easy vegetarian recipe. A great way to get your non-veggie friends and family to try something different! The marinade is out-of-this-world good. Grilled Portobello Mushrooms
Worcestershire sauce Balsamic vinegar Lemon juice Olive oil Garlic Onion Brown sugar Dijon mustard
Simple Instructions
PREPARE MARINADE
Add all of the marinade ingredients to a large bowl and whisk to combine.
MARINATE MUSHROOMS
Dredge the mushrooms in the marinade a few times to coat them. Let the mushrooms marinate for 1 hour, flipping them halfway through.
PREHEAT OVEN
Preheat the grill to 400ºF and clean the grill grates.
SEASON & GRILL ONIONS
Next, place the onion rounds on a plate, drizzle them with olive oil, and season them with salt and pepper. When the grill is heated, transfer onions to the grill over indirect heat. Grill the onions for 10 minutes, flipping halfway.
GRILL MUSHROOMS
Transfer the mushrooms cap side down on the grill over indirect heat. Grill the mushrooms for 3 minutes on the cap side, flip, then grill them for an additional 2 minutes. Place a slice of cheese on the mushroom and close the grill for 1 minute, allowing the cheese to melt. Remove them from the grill.
MAKE SAUCE
While the mushrooms are cooking, combine the hummus and the ketchup in a bowl.
ASSEMBLE BURGER
Now it’s time to put all this goodness together! Place the bottom of the burger bun on a plate, and transfer ½ cup of the greens onto the bun. Top the greens with the mushroom patty, and top the patty with grilled onion rounds.
ADD SAUCE, SERVE + ENJOY
Lastly, slather the top bun with 2-3 tablespoons of the hummus sauce to finish the burger. Serve immediately. Enjoy!
Topping Ideas
Just because this is a portobello mushroom burger doesn’t mean it has to be boring! Here are some fun topping ideas to make your burger even more delicious:
Avocado slices A fried egg Roasted peppers Caramelized onions Pesto BBQ sauce Pickles Sliced jalapeños Dijon mustard
Storage
Store any leftover portobello mushrooms in an airtight container in the fridge for up to 3 days. You want to store the mushrooms separately from the toppings so that the mushrooms don’t get soggy. The toppings can go in smaller airtight containers or Ziploc bags.
Can I freeze my portobello mushroom burgers?
We don’t recommend freezing portobello mushroom burgers, as the texture will be compromised when you thaw and reheat. We recommend making fresh burgers each time!
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