- 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
Combine marinade ingredients. Place caps into a baking dish and pour marinade over top. Use a brush to make sure all caps are covered with the marinade. Set aside and let marinate up to 2 hours.
Remove the portobellos from marinade (do not discard marinade) and place gill side down on a preheated gas, electric or charcoal grill over medium-high heat. Grill 3 to 4 minutes per side. Top each cap with cheese 2 minutes to melt before they are finished grilling.
In a medium bowl combine 1/2 cup mayonnaise and 2 tablespoons of the marinade.
Spread the flavored mayonnaise onto each bun and top with portobellos. Serve with sliced onion, lettuce and tomato.
Recipe courtesy of Angie Ketterman
Recipe courtesy of Rachael Ray