I usually reheat my grilled corn in the microwave. Alternatively, you can wrap in foil and reheat directly on the oven rack or uncovered, on a parchment-lined baking sheet in the oven at 325 degrees Fahrenheit/163 degrees Celsius for 10 minutes. To freshen when it comes out of thr oven, brush with s little coconut oil. It's recommended that you turn half way through the reheating process. You can also reheat it on the barbecue when cooking other items by placing it in the least hottest place on the grill for the duration of whatever your cooking.