You searched for: “mustard
mustard, mustered
mustard (MUHS tuhrd) (noun)
1. A thick and spicy yellow or brownish-yellow sauce that is usually eaten with meat: Lorna likes yellow mustard on her grilled steak.
2. A plant with yellow flowers, leaves that can be used for food, and seeds that are used in making the sauce to flavor certain kinds of edibles: When the field of mustard is in bloom, it is a beautiful sea of golden color.

mustered (MUHS tuhrd) (verb)
1. Called forth, enrolled, have come together: The police mustered the village people to help look for the missing child.
2. Having worked hard to find or to get courage, support, etc.: The men mustered all the strength they could gather together to push the car out of the mud.

The restaurant employees gathered their yellow condiment together to make sure there was an adequate supply; or, in other words, they mustered all of their mustard to make sure they had enough for the next busy days.