Homemade mustard is better than its supermarket counterpart, and it’s stupendously easy to make. Here, the combination of yellow and brown seeds makes for a medium-aggressive kick, but you could use all of one variety if you prefer. Use cold water to soak the seeds, and after puréeing, taste your mustard. You can smooth it out with a little honey, or up the zip with horseradish or chiles. Either way, your mustard will mellow out after a few days in the fridge.
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