---
title: Portobello Burgers
servings: 4
source:
  name: HelloFresh
  url: https://www.hellofresh.com/recipes/portobello-burgers-5739e67cf8b468ecc456b789
time required: 25 minutes
difficulty: easy
allergens:
  - Eggs
  - Milk
  - Soy
  - Wheat
tags:
  - Spicy
  - Veggie
rating: 3.5
rating_count: 822
nutrition:
  calories: 542
  fat: 34
  saturated fat: 4
  carbohydrates: 53
  sugar: 13
  fiber: 9
  protein: 10
  sodium: 342
image: "https://images.recipes.furrysalamander.com/Mushroom%20Recipes/Portobello%20Mushrooms/portobello-burgers.avif"
---

Wash and dry all produce. Peel the onion, then slice end-to-end into thin rings. Separate the rings. Thinly slice the tomato into rounds. In a #small bowl{}, combine the @mayonnaise{2%jar} and as much @hot sauce{4%teaspoon} as you like.

Heat a drizzle of @olive oil{4%teaspoon} in a #large pan{} over medium heat. Add the @yellow onion{2%unit} and cook, tossing, for ~{4-5%minutes}, until softened and slightly golden. Season with @salt{1%unit} and @pepper{1%unit}. Remove from the pan and set aside.

Heat the same pan over medium heat. Rub the @portobello mushrooms{16%ounce} caps on each side with @olive oil{4%teaspoon} and season with @salt{1%unit} and @pepper{1%unit}. Add them to the pan and cook for ~{4-5%minutes} per side, until very soft. Add @balsamic vinegar{1 1/2%tablespoon} to the pan (reserve the rest) for another minute, until the vinegar reduces by half. After tossing the mushrooms in the balsamic glaze, remove from the pan and set aside.

Split the @potato buns{4%bun}. Clean the same pan and heat over medium-high. Add the buns cut-side down and toast for ~{3-4%minutes}, until golden brown.

Halve, pit, and scoop the @avocado{2%unit} flesh into a #small bowl{}; mash with a fork and season to taste with @salt{1%unit} and @pepper{1%unit}.

Finish and serve: In a #medium bowl{}, toss the @arugula{4%ounce} with a drizzle of @olive oil{4%teaspoon}, the remaining @balsamic vinegar{2 1/2%tablespoon}, and a pinch of salt and pepper. Spread the @potato buns{4%bun} with the spicy mayo and top with @portobello caps{16%ounce}, @roma tomato rounds{2%unit}, onions, and mashed avocado. Serve the @arugula salad{} to the side and enjoy!