Red Meat Chili: Carne Chili Colorado

Name: Red Meat Chili: Carne Chili Colorado
Ingredients: 3 white onions, quartered; 8 tomatillos, peeled and washed; 4 tomatoes, quartered; 8 cloves garlic, peeled; 1/2 ounce ancho chiles, stemmed, seeded, and de-veined; 1/2 ounce gaujillo chiles, stemmed, seeded, and de-veined; 1 quart chicken stock; 1 tablespoon ground cumin; 1 tablespoon ground coriander; 1 tablespoon ground mustard seed; 1/4 cup extra-virgin olive oil; Salt and pepper; 1 (1 1/2 to 2 pound) flank steak or brisket; 2 cups water; 12 tortillas; Shredded Monterey jack