This homemade version of Guinness mustard has a nutty, vaguely sweet flavor and a nice mouth feel. It is surprisingly easy to make and it was fascinating to watch the seeds expand as they absorbed the liquid.
I have a mustard-lover in my house. He eats mustard with everything. So I like to make my own, in volume, a quart at a time. It’s so easy, not to mention inexpensive, that there’s really no sense in buying it.