Mexican Lamb Shanks with Mole Sauce

Ingredients

• 4 lamb shanks
• Salt and pepper to taste
• 2 tablespoons vegetable oil
• 1 large onion, chopped
• 3 cloves garlic, minced
• 2 dried ancho chiles, stemmed and seeded
• 2 dried pasilla chiles, stemmed and seeded
• 1/4 cup sesame seeds
• 1/4 cup almonds
• 1/4 cup raisins
• 1 teaspoon ground cinnamon
• 1/2 teaspoon ground cloves
• 1/2 teaspoon ground coriander
• 1/2 teaspoon ground cumin
• 2 cups chicken broth
• 1 can (14.5 oz) diced tomatoes
• 2 ounces dark chocolate, chopped
• 1 tablespoon sugar
• 2 tablespoons apple cider vinegar