Ingredients
- 4 medium onions, sliced
- 2 teaspoons sugar
- 2 teaspoons olive oil
- 1/4 cup water
- 2 teaspoons balsamic vinegar
- 3/4 teaspoon salt, divided
- 1 pound extra-lean ground beef
- 2 tablespoons tomato paste
- 1/4 cup chopped fresh parsley
- 1/4 teaspoon freshly ground pepper
- 4 hamburger buns, toasted
- 4 tomato slices
Description
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