INGREDIENTS
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1 tablespoon butter
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1/2 cup chopped onion
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1 1/2 pounds lean ground sirloin
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1 1/2 teaspoons salt
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1/4 teaspoon pepper
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1/2 teaspoon oregano
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2 tablespoons Worcestershire sauce
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1 (8 ounce) package elbow macaroni, cooked
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according to package directions
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1 (8.75 ounce) can tomato soup, undiluted
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*Optional: 1 cup sliced mushrooms
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*Optiona: 1/2 cup grated Parmesan cheese to sprinke on when eating