Open-Faced Burgers With Onion-Mushroom Topping

• 2 teaspoons olive oil
• 1 medium sweet onion, sliced and separated into rings
• 2 (8 ounce) packages presliced mushrooms
• 1/2 teaspoon salt
• 2 teaspoons balsamic vinegar
• 1 1/2 tablespoons paprika
• 1/2 teaspoon dried thyme
• 1/4 teaspoon ground red pepper
• 1/4 teaspoon fresh ground black pepper
• 1 lb ground round
• 2 English muffins, split and toasted

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.
6. Set aside.
7. Combine the paprika and the next 4 ingredients (paprika through black pepper).
8. Divide the ground meat into 4 equal portion, shaping each into a 1/2 inch thick patty.
9. Coat patties with spice mixture.
10. Grill patties 4 minutes on each side or until done.
11. Place burger patties on muffin halves, and top each burger with 1/4 cup onion mixture.

olive oil, sweet onion, mushrooms, salt, balsamic vinegar, paprika, thyme, ground red pepper, fresh ground black pepper, ground round, muffins

Taken from www.food.com/recipe/open-faced-burgers-with-onion-mushroom-topping-52997 (may not work)