Corned Beef with brisket

1 corned beef brisket (including seasoning packet) 12 flour tortillas or 12 corn tortillas or 12 crisp taco shells, warmed 3 cups shredded cabbage or 3 cups[...]

3 lbs corned beef brisket , cubed 4 tablespoons olive oil 2 quarts beef broth salt & freshly ground black pepper, to taste 1 teaspoon dried oregano 1 teaspoon[...]