Portobello Burgers

Ingredients

Marinade:

• 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

Directions

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.