Caramelized Onion Burgers

Caramelized Onion Burgers

Ingredients:

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

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