We dined at a small-town Mexican restaurant last week. Food was decent enough (though my portion appeared to have been cooked in water from the Dead Sea; as we had just spent several hours lugging stuff in hot, humid weather the salt was actually a good thing).
When we sat down, they brought us a bowl of tortilla chips, along with two bowls for dipping. One had a standard, unremarkable red salsa (perfectly edible, just nothing memoerable). The other appeared to be a bowl of sour cream.
However, on tasting: while the consistency was exactly like sour cream, the taste was quite different. Just a little bit tangy, and the aftertaste had just a hint of spice but no real heat - and it was sweet. Not like melted-ice-cream sweet, but definitely not a savory dish. And on closer visual inspection, it wasn’t pure sour-cream white either, I think there was a slight off-white tint as if from spices or whatever.
It did not taste cheesy (some random googling mentions a dip that involved melted white cheese).