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Rub some salt and pepper in to your roast while you are wating for your grill to heat up. On high heat you want to cook your tri tip roast for five minutes on one side, and then five minutes on the other side. Turn the heat setting down to medium low and cover the tri tip roast with BBQ sauce. Lower the lid to your grill and wait ten minutes. Flip your roast and cook again for another ten minutes. Cover your roast with a fresh layer of BBQ sauce and serve after 15 minutes. This gives the juices time to settle.