2) In a Dutch oven, heat 2 tablespoons olive oil and the butter over medium heat. Once the butter is melted, add the onion, lower the heat, and cook until beginning to soften, about 5 minutes. Add the bell pepper and cook until the onions are almost transparent, about 3 more minutes. Add the mushrooms and cook until everything is nice and soft. Add the garlic and salt and pepper to taste and cook for 2 more minutes.
3) Add the tomatoes, oregano, basil, sugar and remaining tablespoon of olive oil. Increase heat to medium and bring to a boil. Simmer until the sauce has thickened, about 20 minutes. Add the cooked sausage and stir to combine.
4) Meanwhile, as the sauce is simmering, bring a pot of water to boil. Add salt and stir in your pasta. Cook to desired firmness (I like mine a little past al dente). Serve with lots of sauce and a sprinkling of parmesan. Enjoy!
Hearty Pasta Sauce https://www.butteredsideupblog.com/hearty-pasta-sauce-from-scratch/