Ladies and gentlemen, here's the request, which as the pedigreed chowhounds that I know you are, you will honor.
What are different common condiments that are widely used in various parts of the country or world.
For example, there is currently a thread about catsup on mac and cheese in the US. There's a significant part of the population that does this, though it seems weird to others.
Now if you personally love soy sauce on chocolate ice cream ... that doesn't count .. that is just you. Or even the current thread of black pepper on grapefruit .... great tasting, to most, but not really common.
In Guatemala there is the condiment holy trinity ... mayo, catsup and green chilitepe sauce. All three get squiggled on a lot of stuff ... Fries, corn ... pizza. I'm not in love with this trio.
Some people put catsup on chow mein ... ok, but for me, like catsup on mac and cheese, not my thing.
However, that green chilitepe sauce on Chinese food ... sheer greatness ... wonderful on wontons or added to any dish. Chilitepes just have an affinity for Chinese food. That sauce can be bought at most Latino markets in the US. It is called Picamas.
So what in the world are other countries and different parts of the US commonly doing with condiments?