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How to speed up the cooking time of a spatchcock chicken on the grill?

--Gather a large brick, wrap it in clingwrap, heat it on the grill and then place it atop the chicken as it cooks --Gather a large brick, wrap it in foil, heat it on the grill and then place it atop the chicken as it cooks
Gather a large brick, wrap it in foil, heat it on the grill and then place it atop the chicken as it cooks