In a blender, mix together the crushed or diced tomatoes until pureed; set aside.
In a large frying pan over medium-high heat, add the onion, garlic, ground beef, and Italian sausage. Cook and stir until the meat is browned and the onions are softened. Remove from heat and drain the fat from the pan; discard the fat.
Stove Top Method:
Heat just to boiling, reduce heat to medium-low and let simmer approximately 30 minutes, stirring occasionally, until the liquid has reduced to your liking.
Slow Cooker (Crock Pot) Method:
Preheat Slow Cooker. Add the cooked beef mixture to the slow cooker along with the tomato puree mixture, tomato paste, water, red wine, oregano, basil, rosemary, sugar, pepper flakes, salt, and pepper. Stir everything together to combine and cover with slow cooker lid.
Cook on low heat approximately 8 to 10 hour or on high heat for approximately 4 to 5 hours.
When done to your liking, remove from heat and serve over a plate of cooked spaghetti pasta. Learn How To Cook Pasta Properly. Sprinkle with Parmesan cheese and serve.
Makes 6 servings.
Homemade Spaghetti Sauce Recipe: https://whatscookingamerica.net/sauces_condiments/spaghetti-sauce.htm