8 ancho chiles, stemmed, seeded
2 dried pasilla chiles, stemmed, seeded
1/2 tsp. dried oregano leaves
1/4 tsp. ground coriander
3 tomatillos, husked, rinsed, quartered
2 tomatoes, seeded, chopped
1/2 cup dry roasted almonds
1 corn tortilla, torn into small pieces
1 cup fat-free reduced-sodium chicken broth