1 can tomato soup
1/2 c. salad oil
1/4 c. vinegar
2 tbsp. sugar
1 tbsp. onion, chopped
2 tsp. ground mustard
1 tsp. salt
1/4 tsp. pepper
1 tsp. horseradish (optional)

Put all ingredients into a blender and mix well. Chill at least 1 hour before serving. Makes 2 cups.