Cooking apparatus and installations, including barbecue apparatus and installations, barbecues, fitted covers for barbecues, lava rocks for use in barbecue grills, roasting spits (electric) for use with barbecues, rotisseries, rock and ceramic heat distributing materials for use in barbecue grills and cookers, ovens, gas burners for outdoor cooking appliances and apparatus, grills including barbecue grills, kilns, stoves, griddles, toasters, gas barbecues, gas cookers, bakers' ovens, hot plates, roasters, roasting apparatus, roasting jacks, roasting spits, structural plates, brackets and supports including legs for cooking appliances