Right in the middle of harvest, the busiest time at any winery, Cakebread Cellars in Napa Valley invites five chefs from around the world, a group of local artisan food producers and food and wine enthusiasts to take part in the American Harvest Workshop, a five day intensive on food and wine. It’s a hands-on program, with the chefs and other participants literally getting their hands dirty, picking grapes, harvesting veggies from Cakebread’s winery garden, and creating and cooking two five-course dinners for 65 people. As we gather on day one for orientation and a tour of the garden, I can’t help thinking this feels a little like Top Chef. No, it’s not a competition, but the five chefs will be working together as a team, and this is the first time they’ve met each other. Culinary Director Brian Streeter, who is our leader for the workshop, has them choose…