Spicy Miso Portobello Mushroom Burger

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25 mins
10 mins
Spicy Miso Portobello Mushroom Burger

This Asian-style, grilled, vegan Portobello Mushroom Burger is full of delicious umami flavor! Slathered with Asian-style Guacamole, topped with a cool cucumber ribbon salad and crunchy carrot slaw, this recipe is healthy, delicious, and totally vegan.


  • 2 whole wheat buns, grilled
  • 2 large portobello mushrooms
  • 1 Tablespoon Miso ( any color)
  • 1 tablespoon toasted sesame oil
  • 1 tablespoon sriracha
  • pinch of salt and pepper

Cucumber Ribbon Salad:

  • 2 Turkish cucumbers, cut lengthwise into ribbons
  • 1 scallion, sliced at diagonal
  • 1/4 teaspoon salt
  • ¼ teaspoon sugar
  • 2 teaspoons rice vinegar
  • ½ teaspoon toasted sesame seeds

Carrot Slaw:

  • 1 1/2 cups matchstick carrots ( or grated)
  • 1 scallion
  • 1/4 teaspoon salt
  • ¼ teaspoon sugar
  • 2 teaspoons rice vinegar
  • ½ teaspoon toasted sesame seeds

Asian Guacamole:

  • 1 extra-large avocado, cubed
  • 1 teaspoon finely chopped ginger (or use ginger paste)
  • 1 teaspoon rice wine vinegar
  • 1 teaspoon sesame oil
  • ¼ teaspoon salt and pepper
  • pinch chili flakes and sesame seeds


1. Preheat the grill. Using a fork or mini whisk, mix the miso, sriracha, and sesame oil ….& pinch salt and pepper together in a small bowl to make a paste. Brush liberally onto both sides of the portobello mushrooms.

2. Using veggie peeler or mandolin, cut the cucumber into long thin ribbons. Place them in a medium bowl along with scallions and add the dressing ingredients and gently toss.

3. Make the carrot slaw the same way. Place in a small bowl, toss with dressing ingredients. To save time you can combine both the carrots and cucumber (and double the dressing) and serve them together in one bowl.

4. Make the Asian Guacamole, by placing everything in a small bowl, mashing, and stirring a bit until creamy and combined. It doesn’t have to be smooth. Sprinkle with sesame and chili flakes.

5. Grill the portobellos, top sides down first, for 4-5 minutes over medium heat, until juicy and tender. Flip, grill a few more minutes. Grill the Buns.

6. Assemble the burgers: spread buns with a generous amount of Asian Guac, place the portobello (grilled side up, to catch all the flavorful juices) then mound with cucumber ribbon and carrot salad, a little squeeze of sriracha, and optional pickled ginger. Use the remaining Asian Guac on the bun tops, and top the burgers.


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