Chicken Mole

Name: Chicken Mole
Ingredients: 1 (4-pound) chicken, cut into pieces; 1 medium white onion, peeled and quartered; 5 cloves garlic, peeled and smashed; 1 sprig oregano; 1 sprig thyme; Cilantro stems; 1/2 teaspoon black peppercorns; Steamed white rice or Mexican rice, accompaniment; Chopped cilantro leaves, for garnish; Corn Tortillas, accompaniment; 4 dried ancho chiles, stemmed, seeded, and deveined; 4 dried mulato chiles; 4 pasilla chiles; 1 quart chicken stock, reserved from poaching chicken, above; 5 tablespoons vegetable oil, divided; 2 tablespoons sesame seeds; 2 tablespoons shelled unsalted peanuts; 1 medium white onion, cut into large dice; 3 cloves garlic, crushed; 1/2 cinnamon stick, broken into pieces; 3 black peppercorns; 2 whole cloves; 1/2 teaspoon coriander seeds; 1/2 corn tortilla, torn into small pieces; 2 ounces Mexican chocolate or unsweetened chocolate, chopped; 3/4 teaspoon salt