Do-It-Yourself Homemade Mustard Recipe

  • 2/3 cup water
  • 1/2 cup mustard seeds
  • 3 tablespoons dry mustard powder
  • 3/4 cup white wine vinegar
  • 2 teaspoons kosher salt
  1. Blend water, mustard seeds, and mustard powder in a blender until seeds are coarsely ground; transfer to a non-reactive bowl, cover with plastic wrap, and let rest at room temperature until thickened, 4 hours to overnight.
  2. Stir vinegar and salt into the mustard seed mixture.