Chicken-Fried Steak

1 (2 pound) round steak, 1/2 inch thick and
    tenderized by the butcher
2 cups all-purpose flour
2 teaspoons baking powder
1 teaspoon baking soda
1 teaspoon freshly-ground black pepper
3/4 teaspoon salt
1 1/2 cups buttermilk
1 egg
1 tablespoon Tabasco