Double-Mushroom Cheeseburger

This vegetarian burger doubles down on umami with grilled and sauteed mushrooms (plus cheese!).
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double mushroom cheeseburgers with arugula on cutting board

Recipe by Rochelle Palermo

Start to Finish: 30 minutes

Servings: Makes 4 cheeseburgers

Ingredients

  • 1 onion, sliced

  • 8 oz. sliced cremini mushrooms

  • 2 cloves garlic, chopped

  • 4 tbsp. olive oil

  • 4 portobello mushrooms, stemmed

  • 1 cup grated Gruyère

  • 4 hamburger buns, toasted

  • 1/2 cup Dijonnaise

  • 2 cups arugula

Preparation

In skillet, cook onion, cremini, and garlic in 2 tbsp. oil over medium-high, stirring often, until browned, about 15 minutes; season. Brush portobellos with remaining 2 tbsp. oil. In grill pan, cook portobellos, stemside down, over medium-high for 5 minutes. Turn; top with cremini mixture, then cheese. Cook until tender, about 5 minutes. Spread buns with Dijonnaise. Add arugula and portobellos.