Tomato Soup French Dressing

Ingredients:
- 2 Tbsp. sugar
- 2 tsp. dry mustard
- 1 tsp. salt
- 1/2 tsp. pepper
- 1 can tomato soup
- 1/2 soup can vinegar
- 1/2 can oil
- 2 Tbsp. onion

Directions:
- Makes about 3 cups.