Place a single layer of sliced bread across the surface of your grill, turn it on, and set it to medium-high heat. Cook for about a minute and half and then turn off your grill. With the slices of bread still in place, flip them over and check out the doneness level. The more the bread is cooked, the hotter the spot on your grill. This will help you figure out where to cook things like veggies or more delicate cuts of meat. Happy grilling!