condiment
Condiment (noun) means a sauce, relish or seasoning added to food at the table to improve its flavour. Example: “Mustard is the one condiment he refuses to eat.”
How to use condiment
Learner’s notesIn plain EnglishSomething like ketchup or mustard that you add to food to make it taste better.
Neutral; slightly more formal than "sauce".
Fill the gap
Can you complete this real example?
Mustard is the one _____ he refuses to eat.
Etymology
From Latin condimentum "spice, seasoning", from condire "to season, to preserve".