Make your next dinner party a success by kicking off the night with these appetizers; topping mini Ground Beef burgers with fresh mozzarella cheese, juicy tomatoes, fresh basil and balsamic syrup.
Bring vinegar to a boil in 2-quart saucepan. Reduce heat; simmer, uncovered, 9 to 10 minutes or until reduced to 1/3 cup. Set aside.
Meanwhile lightly shape ground beef into eight 1/2-inch thick patties.
Brush polenta slices with oil. Place patties in center of grid over medium, ash-covered coals. Grill patties, uncovered, 11 to 12 minutes (over medium heat on preheated gas grill, covered, 9 to 10 minutes), until instant-read thermometer inserted horizontally into center registers 160°F, turning burgers occasionally and basting with 2 tablespoons reduced vinegar after turning. Arrange polenta around patties; grill 11 to 12 minutes (for gas, grill 9 to 10 minutes) or until heated through, turning once. Season burgers with salt and pepper, as desired.
For each serving, layer 1 each polenta slice, burger, mozzarella slice and tomato slice. Drizzle with remaining vinegar and sprinkle with basil, as desired.
Test Kitchen Tips Prepared balsamic syrup, available in large supermarkets and specialty food stores, may be substituted for balsamic reduction.
Cooking times are for fresh or thoroughly thawed ground beef. Color is not a reliable indicator of ground beef doneness.