Ingredients
- 2 tablespoons brown spicy mustard
- 3 tablespoons balsamic vinegar
- 1/2 cup olive oil
- 1 teaspoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 1 teaspoon hot sauce
- 4 portobello mushroom caps
- 4 slices Gouda cheese
- 1/2 cup mayonnaise
- 4 hamburger rolls
- 1 red onion, sliced
- 4 leaves butter lettuce
- 1 tomato, sliced
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