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Crumble the ground beef along with the onion, into a large skillet over medium-high heat. Cook, stirring frequently, until evenly browned. Drain.
While the ground beef is cooking, bring a large pot of lightly salted water to a boil. Add macaroni, and cook until tender, about 8 minutes. Drain, and stir in butter. Transfer to a large casserole dish, and mix in the ground beef, tomato sauce, and Cheddar cheese. Sprinkle a little salt and pepper over the top.
Bake uncovered for 30 minutes in the preheated oven, or until heated through and bubbly
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