Pennsylvania Dutch Horseradish Sauce
["3/4 c. sour cream", "1/4 tsp. salt", "1/8 tsp. celery salt", "3 Tbsp. horseradish, grated", "1 Tbsp. sugar", "1/2 tsp. dry mustard", "2 Tbsp. vinegar"]
["Whip the sour cream.", "Add other ingredients and whip again. Chill."]
["sour cream", "salt", "celery salt", "horseradish", "sugar", "dry mustard", "vinegar"]