Mexican Beef Brisket

Name: Mexican Beef Brisket
Ingredients: 3 1/2 pounds beef brisket; 1 tablespoon coarse salt; 2 teaspoons freshly ground pepper; Flour for dredging; 1/2 cup vegetable oil; 3 large carrots, peeled and cut into 2-inch lengths; 2 medium onions, chopped; 10 garlic cloves, peeled and minced; 3 dried chipotle or morita chiles; 2 tablespoons tomato paste; 1 tablespoon dried oregano; 2 quarts chicken stock or water; 5 bay leaves; Salt to taste; 4 scallions, white and light green parts, thinly sliced on the diagonal, for garnish