Lemon, Lime, Orange or Lemon Lime Mustard

1 tablespoon Fresh lemon, lime or orange juice
2 teaspoons Honey
Grated zest of lemon, lime or orange peel
1 cup Dijon-style mustard

Mix all in a medium bowl. Transfer to a jar with a tight-fitting lid. Store in a cool dark place for 2 weeks, then refrigerate.