How to Set Up a Two-Zone Fire for Better Grilling
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A two-zone fire is the single most useful technique in grilling. Instead of spreading heat evenly across the whole grate, you concentrate it on one side and leave the other side cooler. This gives you a hot direct zone for searing and a cooler indirect zone for gentle, controlled cooking, all on one grill.
On a charcoal grill, build the fire by banking all your lit coals to one half of the charcoal grate and leaving the other half empty. A chimney starter makes this easy: dump the glowing coals on one side and rake them into an even bed. The empty side sits over no direct flame, so food there cooks by ambient heat with the lid down.
On a gas grill, the setup is even simpler. Light the burners on one side and leave the burners on the other side off. The lit side becomes your direct zone and the unlit side your indirect zone. With three or more burners you get fine control over how large and how hot each zone is.
The payoff is control. Sear steaks, chops, or sausages over the hot side to build a crust, then slide them to the cool side to finish cooking through without burning. Thicker cuts like bone-in chicken can cook mostly on the indirect side and get a quick sear at the end. When fat drips and flames leap up, you simply move food to the safe zone instead of watching dinner char.
Keep the lid closed as much as possible when using the indirect zone, since the trapped heat circulates like an oven. Use a thermometer to check the temperature at the grate and adjust your vents or burners as needed. Once you master the two-zone fire, almost every other grilling technique becomes easier to execute.