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.
The flat iron is the top blade steak, which is derived from the tender top blade roast. Flat iron steaks (also known as butler's steak in the UK and oyster blade steak in Australia and New Zealand) usually have a significant amount of marbling. It's considered by many to be the finest cut of beef available. It's served best grilled or broiled.