Tomato Soup Salad Dressing

• 1 can tomato soup
• 1 cup salad oil
• 1 medium onion – grated (optional)
• 1/2 cup vinegar
• 1/2 cup sugar
• 2 tsp. salt
• 2 tsp. mustard
• Juice of one lemon

Put all ingredients in quart-size jar and shake well. Chill and serve.