Mustard

 is an ingredient used in cooking.

Obtaining
can be purchased at the following shop:

Usage
is used in cooking as a spicy seasoning or random ingredient. It can also be gifted.

Cooking Set
can be used when crafting with the Cooking Set. There is one recipe where it cannot be substituted with other seasoning.

Ack
One of Ack's data chip recipes uses as an ingredient.

Gift
can be given as a gift to other characters.