At the serene kitchen at Roldan 37, Chef Romulo Mendoza prepares a perfect chile relleno, the classic battered and fried poblano chile stuffed with pork picadillo. Then it's off to Pasilla de Humo for Oaxacan-style dried, stuffed pasilla chiles and El Pescadito, a taqueria famous for its deep fried stuffed jalapeno tacos.