Chefs Evan and Sarah Rich of RT Rotisserie in San Francisco make the very best chicken. They use a buttermilk brine that includes umami powder, garlic and Douglas fir—a signature ingredient from their flagship restaurant, Rich Table, that they forage themselves. In this adaptation, the chicken is roasted in the oven, and the brine is made with buttermilk, dried porcini, garlic and rosemary, though if you have access to Douglas fir sprigs, feel free to use them.