"What could be easier than making your own mustard? No, really. It is stupid easy. Grind some mustard seeds, mix with mustard powder and some liquid and you’re done. There is no earthly reason to ever buy mustard once you learn this basic recipe. Endless variations exist. Change the liquid and you change the mustard. Grind the mustard seeds a lot or a little and you change the texture — or skip the whole seeds altogether and use just mustard powder...."