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Portobello Mushroom Burgers – Simple Green Smoothies

grilled portobello mushroom burger on a plate with tomato, arugula a vegan mayo

It’s officially grilling season, and I’m here for it! This summer I’m staying satisfied with these grilled portobello mushroom burgers. They are meaty and marinated, and I love ’em.

Summer is the time when fresh produce abounds, so take full advantage with colorful pasta salad, fresh potato salad, crunch coleslaw and more.

steps for prepping portobello mushrooms including patting dry, marinading, and grilled on a plate with grilled onions

Tips for Grilling Portobello Mushrooms

  1. Don’t rinse directly under the faucet. That’s right, grilling great mushrooms starts BEFORE they go on the grill. Mushrooms shouldn’t be rinsed directly under water. Instead, use a damp cloth or paper towel to rub them clean before marinating.
  2. Marinate well! Grilled portobello mushroom burgers lose a lot of liquid while cooking, so make sure that flavor is locked in. I like to marinate them overnight to make sure they are well coated.
  3. Keep an eye on the grill. Because these burgers are meat-free, you’re just grilling them for the flavor and warmth. They don’t take very long, yet the cooking time differs from grill to grill so keep watch to ensure they are cooked to your liking.

Grilling mushrooms is easier than it looks, I promise! Follow the above steps and you might be eating portobellos on the regular.

overhead view of grilled vegan burgers with fresh toppings on a wooden board

Mushroom Burger Toppings

Because these grilled portobello mushroom burgers are already elevated in taste due to the simple marinade, I want the toppings to be elevated as well. I love the peppery kick of fresh arugula (yet you can use the leafy green of your choice).

Also, I’m already using the grill for the mushrooms, so I like to toss on some sliced red onions as well and get a nice grilled flavor for this topping too.

Ketchup and mustard may be the standard fare for grilling, yet I can’t get enough of this plant-based garlic lemon aioli recipe. It was originally created for my kale caesar salad, yet it works wonders on this veggie burger.

Finally, no burger is complete without a vibrant, beefsteak tomato straight from the garden. You can also use vine-ripened tomatoes, though they are a bit smaller.

platter of buns and grilled portobello mushrooms

Plant-Based Bun Options

If your body can tolerate a regular hamburger bun, then go for it (potato buns work great for these portobello mushrooms). If you’re like me, gluten causes a lot of inflammation throughout my body. If I’m craving the texture and experience of a true burger then I’ll grab a gluten-free bun, but you can also use a head of lettuce to create a lettuce ‘bun’ that’s equally delicious.

Feel free to deconstruct your burger and lay it out on a bed of arugula with the toppings of your choice. It will taste excellent this way as well! What’s your favorite way to eat mushroom burgers?

plant based grilled options

Mushroom Burger Common Questions

How do you prepare a portobello mushroom?

Mushrooms absorb water, so to rinse them off just use a damp towel or cloth to remove any excess dirt from the outside. Remove the stem and scoop out the gills before marinating.

Can you eat the gills of a portobello mushroom?

You can, however, the gills tend to be more fibrous and have a woody taste so it’s better to scrape them out.

What’s in a portobello mushroom burger?

I marinate my mushrooms in a balsamic vinegar mixture to flavor them, then grill them alongside purple onions. You can use a regular burger bun, gluten-free bun, or lettuce wrap, plus whatever toppings you choose. I love topping my burgers with arugula, tomato, grilled red onion and garlic aioli.

portobello mushroom burgers

Portobello Mushroom Burgers

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These marinated portobello mushroom burgers are the perfect, hearty main dish for all your summer parties. They are surprisingly easy to make and delight both meat and plant eaters!

Total Time48 minutes

Servings4

Ingredients

For Marinade:

  • ½ cup balsamic vinegar
  • ¼ cup olive oil
  • 1 tablespoon Dijon mustard
  • 1 tablespoon tamari
  • 1 tablespoon coconut sugar
  • 1 tablespoon rosemary (fresh, finely minced)
  • 1 tablespoon thyme (fresh)
  • 3 cloves garlic (finely minced)
  • 4 Portobello mushrooms

For Serving:

  • 4 buns
  • 2 cups arugula (fresh)
  • 1 tomato (large, sliced)
  • 1 red onion (sliced and grilled alongside mushrooms)
  • garlic aioli (optional)

Instructions

  • Prepare marinade by whisking all ingredients together in a bowl.

  • Prepare mushrooms by wiping mushroom tops clean with a damp cloth. Remove stems. Place in a shallow dish with the stem side facing up. Pour the marinade evenly over the mushrooms. Cover and allow to marinate at least 30 minutes or overnight.

  • Remove mushrooms from marinade. Reserve marinade for basting. If planning to grill red onions for topping, brush the slices with a little olive oil. Grill mushrooms and onions for 5-7 minutes per side, basting periodically with the reserved marinade. Transfer to a clean plate. The mushrooms will release liquid during and after grilling, so it’s best to leave them stem side down after grilling.

  • Assemble the mushroom burgers with toppings and serve immediately.

Notes

  • Nutrition facts include serving on a gluten-free bun.
  • Tamari is a gluten-free soy sauce. For a soy-free option, use coconut aminos.
  • The longer you marinate the portobello mushrooms, the more flavorful they will be. If you have time, start marinating the night before you want to grill. 
  • Cashew cream and vegan parmesan sprinkle are also great toppings.

Nutrition (estimated)

Calories: 410kcal (21%) Carbohydrates: 56g (19%) Protein: 6g (12%) Fat: 20g (31%) Saturated Fat: 4g (25%) Polyunsaturated Fat: 2g Monounsaturated Fat: 11g Trans Fat: 1g Sodium: 457mg (20%) Potassium: 573mg (16%) Fiber: 5g (21%) Sugar: 15g (17%) Vitamin A: 597IU (12%) Vitamin C: 12mg (15%) Calcium: 79mg (8%) Iron: 2mg (11%)

Summer Main Dishes

I’ve added many of my favorite summer recipes to the blog to help you enjoy a plant-based summer like no other. Besides my portobello mushroom burgers, here’s what I like to bring to parties all season long:

And don’t forget about the side dishes! With these recipes, you’ll be set for a summer full of incredibly delicious food made with plants.

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