Horseradish sauce

Make as described, leaving out the herbs and flavouring with 2–3 teaspoons of grated horseradish and 1–2 teaspoons of red wine vinegar. This is even nicer if you add a little mayonnaise, or replace 2 tablespoons of the yoghurt with 2 tablespoons of mayonnaise. This is wonderful with walnut p?t? en cro?te.