1/2 cup yogurt
1 cup cottage cheese
1 tablespoon butter
1 teaspoon prepared horseradish
1/4 teaspoon salt
1/2 teaspoon ground nutmeg
1/4 teaspoon dried parsley, crushed
In a medium bowl, blend yogurt, cottage cheese, butter and horseradish.
Mix together salt, nutmeg, parsley, mustard and butter. Spread mixture over evenly in the tartarian sauce, stirring constantly. Chill in refrigerator for 24 hours.