I'm a food segregationist.
I think candy in ice cream does a disservice to both the candy and the ice cream. Keep them apart and you have two delicious things.
Separate but equal.
I apply this obviously personal maxim especially to barbecue (and yes, I'm a vegetarian, and this goes for barbecue tofu dishes as well): on spaghetti, on nachos, on pizza.
My coworker argues this borders on food not touching or even any sort of sauce on noodles and the like. He's missing my point.
I'll take one pizza, please. Hold the barbecue.
Image: Barbecue nachos at AutoZone Park from chickasawbluffing.com