A three-zone fire is a setup where some of the coals are piled in a double layer on one side of the grill, which gives you a very hot zone for searing. The remaining coals are arranged in a single layer in the center of the grill, which gives you a moderately hot zone for cooking. The remain- ing area of the grill is left without coals, which gives you a cool zone where you can move the food if it starts to burn. A garden hoe makes a handy tool for spreading out the coals to make a three-zone fire. Once the coals are arranged, wait until they start to ash over before grilling.