Brown sausage and ground beef together. Set aside.
Saute onions in butter and olive oil over medium heat until onions begin to turn a light caramel color. Add garlic and cook an additional 2 minutes.
Stir in the tomato sauce and paste, and the chopped tomatoes. Add herbs, spices and brown sugar. At this time, you may choose to use an immersion blender and lightly blend the mixture for a less "chunky" sauce. I sometimes do, sometimes not.
Separate out the portion that you want to reserve as vegetarian. You can leave this meatless, or add in your favorite veggie-meat option at this time.
To the "meat" portion, add the browned ground beef and sausage, and the Worcester Sauce. (You can add the Worcester Sauce earlier if you use a vegetarian variety.)
Simmer sauce for at least an hour. I usually make this the day before to allow the flavors to fully blend, and reheat it in the slow cooker on low the day I plan to serve it.
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