Three times a year, Mark Skudlarek fires his three-chamber kiln at Cambridge Pottery in Cambridge, Wis., borrowing some of the kiln's coals to place them in an outdoor wood-fired oven and in the grill for a celebratory feast, and Roger Mooking is there to taste the goods from the custom-designed earthenware bakers. In Deadwood, Ore., a couple turned a metal barrel into an everyday, outside oven. They invite Roger to pick produce from their bountiful garden and help prepare their favorite family recipes.