Caramelized Onion Burgers

An excellent grilled burger from the Southern Living's cookbook "30 Years of Our Best Recipes".

• Ready In: 1 hr
• Serves: 4

Ingredients

• 4  medium onions, sliced
• 2  teaspoons sugar
• 2  tablespoons olive oil
• 1⁄4 cup water
• 1  tablespoon  balsamic vinegar
• 3⁄4 teaspoon salt, divided
• 1  lb ground beef
• 1⁄4 cup  chopped parsley
• 2  tablespoons tomato paste
• 2  teaspoons Worcestershire sauce
• 1⁄4 teaspoon fresh ground pepper
• 4  hamburger buns, toasted
• 4  slices tomatoes
•  lettuce leaf

Directions

1. Cook onions and sugar in hot oil over low heat 20 to 25 minutes until onion is caramelized, stirring often. Stir in the 1/4 cup water, vinegar, and 1/4 teaspoon of the salt. Set aside and keep warm.
2. Combine beef, parsley, tomato paste, Worcestershire sauce, 1/2 teaspoon salt, and pepper. Shape into 4 patties.
3. Grill over medium-hot heat until beef is no longer pink.
4. Serve on buns with caramelized onions, tomato slices and lettuce.