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Export 6 ingredients for grocery delivery
Step 1
Combine all the ingredients, except the horseradish, in a stainless-steel bowl. Cover, and let stand for 2-3 days.
Step 2
Put the ingredients in a blender and whiz until as smooth as possible. Add 2 to 4 tablespoons of water if the mustard is too thick. Blend in the horseradish, if using.