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.
While you're preheating your oven to 450 Â°F (232 Â°C), heat cooking oil in a cast iron skillet on high heat. Cook one side of the steak in the skillet for 2-3 minutes. Then, flip the steak and cook the other side for 1-2 minutes. Finally, put the cast iron skillet in the oven and cook the steak for 6-8 minutes.