Whole mustard seeds have little aroma, and have to be ground for the flavors to awaken. The enzyme myrosinase is what gives mustard its acrid pungency and penetrating heat. However, it’s a fickle enzyme.
Ground mustard seeds.
How to Use
Water must be added for the enzyme’s flavor to bloom and temperature matters. Cold water will ensure a mustard paste that is intensely hot, bitter, acrid, and pungent (possibly to the point of it being inedible if the water is ice cold). Warm water will mellow it out and hot water will negate the flavor all together.