Even carnivores will give this hearty burger the thumbs up.

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Ingredients

Ingredient Checklist

Directions

Instructions Checklist
  • Preheat oven to 425 degrees. On a large rimmed baking sheet, toss mushrooms with oil and 2/3 cup water; season with salt and pepper. Arrange stemmed side down; cover loosely with foil. Roast until tender, 30 to 45 minutes.

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  • Meanwhile, in a medium mixing bowl, mash avocado with a fork. Stir in mustard, horseradish, and lime juice. Fold in jalapeno season with salt and pepper.

  • Toast rolls. Dividing evenly, layer each bottom half with tomato and portobello, and each top half with avocado mixture.

Reviews (3)

29 Ratings
  • 5 star values: 6
  • 4 star values: 10
  • 3 star values: 11
  • 2 star values: 1
  • 1 star values: 1
Rating: Unrated
08/27/2012
This recipe is great, but why oh why do you not provide serving/nutrition information for these recipes.
Rating: 4 stars
08/06/2011
A very tasty and simple vegetarian recipe. The avocado with mustard and horseradish really work.
Rating: Unrated
07/01/2010
The Portobello was great... very yummy! But way too much horseradish and fresh lime juice in the spicy avocado sauce... not sure about the amount of spicy brown mustard because the horseradish and lime juice were so overwhelming. I couldn't taste any avocado. The spicy avocado sauce would be great with just a little less horseradish (coming from a person who loves horseradish) and lime juice. Definitely will make again!
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