Place oil, butter, and diced onion in Dutch oven or large sauté pan and sauté until onions are translucent. Add carrots, celery, and garlic, and sauté another 2 minutes. 

Add meat, salt, pepper, and herbs. Chip up the meat and cook until brown. Add milk and a dash of nutmeg, cover, and simmer on lowest possible heat until the milk has disappeared (~30 minutes). After the milk has been absorbed, add the white wine and simmer until it disappears (another 30 minutes). 

Lastly, add the tomatoes and the cheese rind, and cook on lowest heat for at least an hour – long enough for the meat to break down thoroughly. Add splashes of water as required to keep the sauce from burning but at the end, all of the liquid should be gone. Taste and adjust for salt.

Spoon sauce over cooked and drained pasta, and top with finely grated parmesan cheese. Or use in my Authoritative Lasagna recipe!

Cooking Note: the method here may seem strange, but what you are going for is to cook flavor into the meat and completely break down the vegetables. First, you are asking the meat to absorb milk. Then, white wine. And then you make the sauce by adding the tomatoes. The sauce gets flavored with additional seasoning from this point and the cheese rind.