Preheat oven to 300° F (150°C).
Combine dry onion soup mix, flour and garlic in an oven roasting bag; close bag and shake well.
Season brisket with salt and pepper and place in bag. Pour in beef broth and Worcestershire sauce.
Close bag, place in a shallow baking pan and make a few slits with a sharp knife in the top of the bag to vent it.
Bake for 4 hours, or until tender.
Servings: 10