This was so much fun -- my first time ever making my own mustard! I couldn't believe how easy it was ... this recipe is extremely easy. It made a very mild, sweet mustard -- reminded me a bit of the cranberry mustards that show up around holiday time. I used yellow mustard seeds, but next time I'll try some of Penzey's brown mustard seeds, or a combination, to see if I can make it a bit spicier. This was terrific! Oh, I'd say it makes a bit less than a cup ... certainly not more than that. Thanks for posting this!