I like pouring baked beans over French fries. I put apple sauce on top of I have any. Slightly less lazy I'll make Mac n cheese instead of fries, but fries cook on their own.
My friends, and it would seem people in general, don't seem to view plain unsweetened apple sauce as a sauce the same way I do.
It goes well over many things.
I think dipping fish sticks in it crossed a line for one friend but their reaction was great.