Combine all your dry ingredients to create your brisket rub for marination. Add your Tandoori Masala, salt, pepper, garlic and onion powder, bay leaf and chilli powder/flakes. Rub both sides of your brisket completely with your dry rub and place in your baking tray to sit for at least 1 hour. For better taste let this sit uncovered for at least 24 hours.
Preheat the oven to 350 degrees F and grab your marinated brisket. Fill your baking pan with about 1/2 inch of beef stock. The bottom layer of your brisket should be submerged in stock.
Lower your oven to 300 degrees F and cover your pan tightly with aluminum foil and bake for 3 hours. Be sure to keep an eye on your brisket as it cooks, because it can easily be forgotten and become overcooked.
As you near the end (about 1 1/2 hours to completion) you can drizzle or spread some of the honey mustard sauce. This will help cut some of the spicy heat in your brisket and add a unique taste.