However, itâs also a time to be aware of the dangers soaring temperatures can bring. Extreme heat is the number one weather-related killer in the U.S, claiming more than 650 lives across the nation each year, according to the Centers for Disease Control and Prevention.
1 In a bowl whisk together garlic, extra virgin olive oil, balsamic, 1/4 cup red wine, 1 tablespoon chopped rosemary, salt and pepper.  Place flat iron steak in a resealable plastic bag. Pour marinade over the top. Shake to coat steak in marinade. Refrigerate for 8 hours or overnight.
Cook 8 to 20 minutes or until of desired doneness, turning once. 1 GRILL DIRECTIONS: In 12x8-inch (2-quart) baking dish or resealable food storage plastic bag, combine all marinade ingredients; mix well. Add round steak; turn to coat. Cover dish or seal bag. Refrigerate at least 3 hours, turning once. 2 Heat grill. When ready to grill, remove steak from marinade; discard marinade. Place steak on gas grill over medium heat or on charcoal grill 4 to 6 inches from medium coals. Cook 8 to 20 minutes or until of desired doneness, turning once. 1 GRILL DIRECTIONS: In 12x8-inch (2-quart) baking dish or resealable food storage plastic bag, combine all marinade ingredients; mix well.