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.
Immediately place steaks in the middle of hot, dry pan (if cooking more than one piece of meat, add the pieces carefully so that they are not touching each other). Cook 1 to 2 minutes without moving; turn with tongs and cook another 1 to 2 minutes. Remove from heat and put the cast iron skillet with the steaks in it into the oven. Cook an additional 3 to 5 minutes, depending on thickness of steaks and degree of doneness you like.