Jul 14 2026
RestaurantsFire by the MononGarden Veggie Sandwich Recipe

Garden Veggie Sandwich Recipe

Inspired by Fire by the Monon
Time1h
Serves2

Grilled marinated portabella mushroom cap topped with roasted peppers, caramelized onions, fresh mozzarella & basil pesto

Was this page helpful?

Help improve this recipe for others.

Send this recipe to your inbox.

We'll email it straight to you - plus weekly cooking inspiration.

Ingredients

Some product links may be affiliates. If you buy through them, you're supporting the site and Pekin may earn a commission at no extra cost to you.

Sandwich Ingredients

Method

Preparation Steps

  1. 1

    Marinate the Portabella Mushrooms

    In a bowl, mix olive oil, salt, and black pepper. Coat the portabella mushroom caps with the marinade and let them sit for at least 30 minutes.

  2. 2

    Caramelize the Onions

    Slice the onion thinly. In a skillet over medium heat, add a tablespoon of olive oil. Add the onions and cook, stirring occasionally, until they are soft and golden brown, about 15-20 minutes.

  3. 3

    Grill the Mushrooms

    Preheat a grill or grill pan over medium-high heat. Grill the marinated portabella caps for about 5-7 minutes on each side, or until tender and grill marks appear.

  4. 4

    Assemble the Sandwich

    On one slice of bread, spread 2 tablespoons of basil pesto. Add the grilled portabella mushroom, roasted red bell peppers, caramelized onions, and slices of fresh mozzarella. Top with the second slice of bread.

  5. 5

    Toast the Sandwich

    In the same skillet used for the onions, add a little olive oil and toast the sandwich on both sides until the bread is golden and the mozzarella is melted, about 3-4 minutes per side.

  6. 6

    Serve

    Cut the sandwich in half and serve warm.

More from Fire by the Monon