Cooking grill with trellis burner

A grill or BBQ appliance that is generally intended for outdoor use has a pivoting hood disposed in hinged connection with a grill body, both of which are raised above a firebox that receives a food support grate including a set of food support modules. A gas burner assembly including a set of modular trellis burners may be positioned along the lower end of the firebox. A set of radiant tray modules may be correspondingly positioned between food support modules and burners. Branches of burner trellises may be spaced apart in distances corresponding to locations of an array of tiles grasped by the radiant tile module.