Peel and quarter the apple and remove the core. Drizzle the apple with a little lemon juice so that it doesn`t turn brown. Then grate finely and place in a bowl.
Peel the horseradish, grate it finely and mix it with the grated apple. Add the juice of half a lemon, mix in and season with sugar and salt.
Whip the cream until stiff and fold it loosely into the apple and horseradish mixture. Arrange on plates and decorate with apple wedges.
The sauce tastes good with cold roast meats, smoked pork, smoked trout or salmon.