- 1 (10.75 ounce) can condensed tomato soup
- 1 cup vegetable oil
- 3/4 cup white sugar
- 1/2 cup vinegar
- 1 teaspoon dry mustard powder
- 1 teaspoon salt
- 1 teaspoon celery seeds
- 1/4 teaspoon coarsely ground black pepper
- 1/8 teaspoon garlic powder
- 1/4 teaspoon cornstarch, or as needed (optional)
- Mix tomato soup, vegetable oil, sugar, vinegar, dry mustard, salt, celery seeds, black pepper, and garlic powder in a large jar with a lid. For thicker dressing, stir in cornstarch. Serve immediately or refrigerate overnight for best flavor.