Tlacoyos can be filled with beans, potatoes, mushrooms or cheese and are often topped with grilled cactus, onions, cilantro, and salsa. Jasmine Garsd for NPR hide caption

itoggle caption Jasmine Garsd for NPR

Three of the six moles served at Casa Oaxaca of Washington, D.C. Some of these mole recipes were passed down to chef Alfio Blangiardo by his grandmother. Karen Castillo Farfán/NPR hide caption

itoggle caption Karen Castillo Farfán/NPR