1

Is there a generic umbrella term that can be used for anything liquid that is added to, for example, a Subway hamburger? That is, mustard, ketchup, etc.?

2

'Sauce' works:

1: a condiment or relish for food
especially: a fluid dressing or topping

(source: Merriam-Webster)

Both examples you mention, mustard and ketchup, are listed on the Wikipedia page.

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