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Cook pasta according to package directions.
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Heat butter and oil over medium heat. Add onion and garlic and sautee until the onions start to caramelize. Pour in the tomato sauce, salt, pepper, and sugar. Stir and cook over low heat for 10 minutes, stirring occasionally.
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Add the half and half, parmesan, and zucchini. Allow the zucchini to wilt into the sauce, stirring, for 3 minutes or until soft.
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Add the fettuccine and basil and serve immediately, topped with more parmesan, basil and the sliced Italian sausage.