Delicate slow cooked beef in a homemade ragu puts a smile on everyones face. You can let this dish simmer all day without worry. I usually have a nice garlic bread to accent this meal, with a side of arugula and fennel salad.
In a microwave safe bowl, mix together onion, tomato paste, garlic, oregano, rosemary, and oil. Heat for 5 minutes in microwave, stirring occasionally. Transfer to slow cooker. Add tomato puree, soy sauce, salt, pepper, and bay leaf. Stir. Add beaf. Cover and cook 9 hours on low or 6 hours on high.
Discard bay leaf. Break beef chunks into 1 inch pieces using tongs or a fork. Stir in vinegar.
Cook pasta according to directions. Drain pasta. Combine pasta and sauce. Serve.