Add chiles guajillo, chiles ancho, onion, and garlic cloves to a saucepan and cover with about 5 cups of water. Simmer for about 20 minutes or until the chiles are softened. Remove from heat and drain water.
6 chiles guajillo, 2 chiles anchos, ¼ onion, 2 garlic cloves, 5 cups water
Transfer to a blender. Add pineapple juice, vinegar, achiote paste, dried Mexican oregano, black pepper, cumin, chicken bouillon, whole cloves, and salt. Blend until smooth. Your al pastor marinade is ready; it yields about 2 cups, enough to marinate about 3 pounds of meat.
½ cup pineapple juice, ¼ cup apple cider vinegar, 3.5 oz achiote paste, 1 tsp dried Mexican oregano, 1 tsp ground cumin, 1 tsp black pepper, 1 tsp chicken bouillon, 1 tsp salt, 2 whole cloves