I'm thinking a sour cream/hot sauce mix. Then the other stuff, lettuce, maybe some pico. I've got some extra fish and am thinking about doing a indirect almost smoking technique on them. I've always just grilled fish direct but we had some smoked mullet dip in Florida last Summer that was pretty good. (Don't hate on it, it really was pretty good, I saw it on the menu and thought when am I ever going to see this again). Anyway, I'm thinking a hot smoke with some pecan might give the tacos some different flavor.