Set a heavy-bottomed 6 quart sauce pot over medium heat. Add the butter and onions. Stir and soften the onions for 5-8 minutes. If they start to brown, turn the heat to medium-low.
Stir in the garlic and sauté another 2 minutes. Then add in the ground sausage, ground beef, and dried oregano. Cook and break the meat into small pieces with a wooden spoon. Once the meat pieces are well browned, stir in tomato sauce and crushed tomatoes.
Cover and simmer for 30-60 minutes, stirring occasionally. (As long as it simmer for 30 minutes it’s ready. However, you can let it simmer as long as you like.)
Stir in the fresh chopped basil. Taste, then salt and pepper as needed. If the meat sauce tastes too acidic, stir in 1-2 tablespoons sugar.
Serve warm with pasta.
Salt: The ground sausage and canned tomatoes are both salty. It’s best to let the sauce cook a little while before deciding if you want to salt it. Sugar? Sometimes canned tomatoes can be overly acidic and benefit from a little bit of sugar to balance the flavor. Only use if needed, and remember, a little goes a long way.