Add all the ingredients into a quart jar.
Let sit for at least 24 hours to hydrate the Mustard seeds.
Cold water stored in the refrigerator for a hot and spicy mustard or hot water stored on the counter for a more mellow mustard.
Mustard seeds can sit in the salt and vinegar mixture for up to six months before moving on to the next step. Fermented mustard is the Farmer's favorite way to have mustard.
Pulse the seed/vinegar mixture in your food processor, leaving some of the seeds course, for texture.
Store in the refrigerator in a sealed glass container for up to one year. The mustard will thicken after a few days. Add filtered water, one Tablespoonful at a time, if it begins to dry out.