1. Preheat the oven at 325 ºF.
2. In a bowl, combine mustard, sugar, onion powder, garlic powder and chili powder.
3. Place the beef in a baking dish. Add the bowl mix, salt and pepper.
4. Cook for 1 hour.
5. Add beef stock and water. (1/2 inch of liquid in the bakind dish)
6. Cook for 3 hours.