1. A thick and spicy yellow or brownish-yellow sauce that is usually eaten with meat: “Grilled chicken tastes great when served with mustard sauce.”
2. A plant with yellow flowers, leaves that can be used for food, and seeds that are used in making the sauce to flavour certain kinds of edibles: “The mustard fields resemble a yellow river when in full blossoms during the Vasanta season in the Punjab.”
Mustered , on the other hand, has the following meanings:-
1. Called forth, enrolled, come together: “The old man mustered the entire village when he found that his house had been robbed”.
2. Having worked hard to find or to get courage, support, etc.: “One has to muster ones guts to stand against the anti-social elements.”