Tomorrow I'm doing a BBQ for about 30, Tri Tip will be the main course, cooked over a gas grill. I know this has been asked before, but i'm headed out to the store, and don't have time to search. Ideas for a quick and dirty but tasty Au Jus, since the meat is grilled I won't have pan juices to do with [its own] juice"; jus is the juice itself. I don't have access to Demi Glace, I do have beef base, and or bullion. Your help is appreciated..