Pasilla mole

Name: Pasilla mole
Ingredients: 4 dried pasilla chillies, seeds and stems removed; 3 dried guajillo chillies, seeds and stems removed; 2 medium tomatoes; 1 onion, quartered; 1 pear, halved but core left in; 2 garlic cloves; 40g sesame seeds; 60g peanuts, blanched; 5g cinnamon stick; 3 cloves; ½ tsp oregano; ½ tsp coriander; ½ tsp cumin seeds; 10 black peppercorns; 3 tbsp pork lard or sunflower oil; 300-400ml hot vegetable stock; 1 tbsp tomato purée; 45g dark chocolate