Cabernet-Balsamic Burgers With Sautéed Mushrooms & Onions

• 5 teaspoons olive oil, divided
• 4 cups thinly sliced red onion
• 1 1/2 teaspoons chopped fresh thyme
• 1/2 cup cabernet sauvignon or other dry red wine
• 2 tablespoons balsamic vinegar
• 3/4 teaspoon salt, divided
• 1 (8-ounce) package sliced mushrooms
• 1 1/2 pounds ground sirloin
• Cooking spray
• 1/3 cup light mayonnaise
• 1 ounce blue cheese, crumbled (about 1/4 cup)
• 1 garlic clove, minced
• 6 (1 1/2-ounce) whole-wheat hamburger buns
• 1 1/2 cups baby arugula

1. Heat a large nonstick skillet over medium-low heat. Add 2 teaspoons olive oil to pan; swirl to coat. Add onion and thyme; cook 17 minutes or until golden and very tender, stirring occasionally. Increase the heat to medium-high; add wine, vinegar, and 1/4 teaspoon salt. Cook for 6 minutes or until the liquid almost evaporates, stirring occasionally. Remove onion mixture from pan.
2. Wipe pan clean with paper towels. Heat pan over medium-high heat. Add the remaining 3 teaspoons oil to pan; swirl to coat. Add mushrooms and 1/4 teaspoon salt; saute for 8 minutes or until mushrooms brown and liquid mostly evaporates.
3. Preheat grill to medium-high heat.
4. Coarsely chop 1 cup onion mixture, and stir chopped onion mixture into beef. Divide the beef mixture into 6 equal portions, gently shaping each into a 1-inch-thick patty. Press a nickel-sized indentation in center of each patty. Sprinkle the patties with remaining 1/4 teaspoon salt. Place patties on a grill rack coated with cooking spray, and grill for 4 minutes on each side or until done.
5. Combine mayonnaise, blue cheese, and garlic in a bowl, and mash well with a fork. Spread the top halves of buns evenly with mayonnaise mixture. Arrange 1/4 cup arugula on bottom half of each bun; top each bottom half of bun with 1 patty, about 2 tablespoons remaining onion mixture, about 1/4 cup mushrooms, and top half of bun.

olive oil, red onion, thyme, cabernet sauvignon, balsamic vinegar, salt, mushrooms, ground sirloin, cooking spray, light mayonnaise, blue cheese, garlic, buns, baby arugula

Taken from www.myrecipes.com/recipe/cabernet-balsamic-burgers (may not work)