The lid is shaped like a ducks head, but that's about the only thing you can decipher from it as all the writing is in Korean. You pass it over to your grocery guide for him to look at. He takes it and puts it into the cart without looking at it and assures you, in a slightly petulant manner, that it is mustard. You:

take it back out and make him read it, just to be sure.

figure that, mustard or not, it doesn't really matter and move on to other things.