Ingredients
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2 teaspoons sugar
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2 tablespoons olive oil
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1/4 cup water
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1 tablespoon balsamic vinegar
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3/4 teaspoon salt, divided
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1 lb ground beef
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1/4 cup chopped parsley
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2 tablespoons tomato paste
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2 teaspoons Worcestershire sauce
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4 hamburger buns, toasted
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4 slices tomatoes
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lettuce leaf
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4 medium onions, sliced
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1/4 teaspoon fresh ground pepper
Instructions
- 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.
- Combine beef, parsley, tomato paste, Worcestershire sauce, 1/2 teaspoon salt, and pepper. Shape into 4 patties.
- Grill over medium-hot heat until beef is no longer pink.
- Serve on buns with caramelized onions, tomato slices and lettuce.