The disclosed technology includes a grill accessory for use with a kamado-style grill to enable a user to control the flow of heat throughout the grill and maintain temperature of the cooking chamber. The grill accessory may enable a user to control the flow of heat throughout the grill, providing the user with greater customization of cooking options. The grill accessory may further enable a user to visually inspect a cooking food item while reducing the amount of heat loss from the grill.