Open-Faced Burgers with Onion-Mushroom Topping

Ingredients

• 2 teaspoons balsamic vinegar 
• 0.3 teaspoon pepper black freshly ground
• 0.5 teaspoon thyme leaves dried
• 2  muffins split english toasted
• 0.3 teaspoon ground pepper red
• 1 pound ground round 
• 16 ounce pre mushrooms 
• 2 teaspoons olive oil 
• 1.5 tablespoons paprika 
• 0.5 teaspoon salt 
• 1 medium onion sweet separated sliced

Equipment

• frying pan
• grill

Directions

1. Preheat grill.
2. Heat oil in a large nonstick skillet over medium-high heat.
3. Add onion, and cook for 5 minutes or until golden.
4. Add mushrooms and salt; cook 5 minutes, stirring constantly.
5. Add vinegar; remove mixture from pan. Set aside.
6. Combine the paprika and the next 4 ingredients (paprika through black pepper). Divide the ground round into 4 equal portions, shaping each into a 1/2-inch-thick patty. Coat patties with spice mixture. Grill patties 4 minutes on each side or until done.
7. Place burgers on muffin halves, and top each burger with 1/4 cup onion mixture.