Fragrant Shredded Beef Stew

Name: Fragrant Shredded Beef Stew
Ingredients: 1 tablespoon ground cumin; 10 corn tortillas, heated (see Tip); 1/4 cup sherry vinegar; 3 cloves garlic, minced; 1/2 teaspoon freshly ground pepper; 2 stalks celery, thinly sliced; 1 teaspoon salt; 1 large onion, chopped; 3 pounds flank steak, trimmed of fat, each steak cut into thirds; 1/2 cup packed fresh cilantro leaves, chopped; 1 large red bell pepper, seeded and chopped; 1 1/2 cups reduced-sodium chicken broth; 1/2 cup chopped pickled jalapenos