Ingredients
- 1 tablespoon balsamic vinegar
- 1 tablespoon extra virgin olive oil
- Salt and pepper to taste
- 4 thick slices tomato
- 1 1/3 pounds lean ground beef
- 1 tablespoon tomato paste
- 1/4 cup chopped fresh basil
- 1/4 cup grated Parmesan cheese
- 1 clove garlic, minced
- 1/4 teaspoon black pepper
- 4 ounces fresh mozzarella cheese, sliced
- 4 hamburger buns, split
Directions
Whisk the balsamic vinegar, oil, salt, and pepper in a small bowl. Pour over tomato slices to marinate.
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Preheat an outdoor grill for medium-high heat, and lightly oil the grate.
Mix ground beef, tomato paste, basil, Parmesan cheese, garlic, and 1/4 teaspoon pepper in a large bowl. Form beef mixture into 4 equal patties.
Cook on the preheated grill until the burgers are cooked to your desired degree of doneness, about 5 minutes per side for well done. An instant-read thermometer inserted into the center should read 160 degrees F (70 degrees C). Top each burger with mozzarella cheese; allow to melt. Serve on hamburger buns with marinated tomato slices.