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.
Beef Marinade. Marinating is best suited for the tougher steak cuts like flank, skirt, sirloin, round and hanger. These cuts can usually marinate up to 24 hours. You can actually ruin better-quality steaks, like porterhouse or rib-eye, by marinating them.