This creamy horseradish sauce is a Czech classic that comes together in minutes. A light roux loosened with milk makes the base, and grated horseradish, vinegar, salt and sugar bring it to life. Serve it with dumplings, and add a slice of meat or a hard-boiled egg if you like.
Heat the butter with the oil, add the flour and let it foam to make a light roux. Pour in the milk and stir quickly and thoroughly.…
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