Steak San Marco
Ingredients
- 1 1/2 pounds beef stew meat
 - 2 (8 ounce) cans tomato sauce
 - 1/4 cup vinegar
 - 1 (1 ounce) package dry onion soup mix (such as Lipton®)
 
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Instructions
- Combine beef stew meat, tomato sauce, vinegar, and onion soup mix in a slow cooker.
 - Cook on Low until the beef is tender, 4 to 6 hours.
 
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