Carne Guisada (Beef Stew)

This recipe can be used for Beef Stew Tacos.

1 (1 1/4 pound) chuck roast, cut into bite-size pieces
2 tablespoons all-purpose flour
1 tablespoon vegetable oil
1 green bell pepper, chopped
1 medium onion, chopped
1 or 2 fresh jalape