I find the small holes of a standard box grater do a nice job grating the horseradish. Also, if you can't find horseradish root, you can make this sauce using prepared horseradish (from a jar), you'll just have to trust your taste buds related to how much of the paste to add. Stir a bit along with the mustard into the sour cream, and omit the vinegar and sugar. Salt to taste.
2 tablespoons cider vinegar
1/4 teaspoon fine grain sea salt, or to taste
1/2 teaspoon sugar or honey
1 teaspoon mustard (not ground mustard)
2-3 inch segment of horseradish root, peeled
1/2 cup / 120 ml sour cream
to serve: toasted sesame seeds
Combine the vinegar, salt, sugar, and mustard in a small bowl. Grate the horseradish into the mixture, you'll want about 2-3 tablespoons total. Stir and allow it to sit for a few minutes before gradually whisking in the sour cream. Taste and adjust to your liking. I serve sprinkled with toasted sesame seeds.
Makes 2/3 cup.
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