In the days leading up to Dish Fest, we’re presenting our readers with exclusive chef interviews so they can learn the stories behind the Best Dishes being served at the inaugural festival. The worst iterations of mole, a signature dish of the Mexican states of Oaxaca and Puebla, are chalky, grainy or so chocolatey they read as dessert instead of dinner. Casa Corazón’s version is the very best: poblano chiles, nuts, spices and Mexican chocolate roasted,...