The cornerstone of any outdoor kitchen is the grill. It can be free-standing, like the Kalamazoo grill above, or built into weather-resistant permanent housing, like the Cal Spas grill below. Just as grills come with add-ons (the Kalamazoo grill has a sideburner and storage drawers), so do outdoor kitchens. You can add anything from a prep sink to a refrigerator in modular units.;