And while a basic mustard simply involves soaking tangy mustard powder (or ground mustard seeds) in vinegar, water or other liquid, once you start experimenting with herbs and other flavors, the possibilities are endless!Lime Mustard with Coriander, from Mustards, Ketchups & Vinegars, by Carol W. Costenbader2 1/8 cups white mustard seeds, ground2 tbsp mustard powder1/2 cup water2/3 cup white wine