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Melt butter in large frying pan and gently fry onion until soft.
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Add pepperoni, mushrooms and capsicum and cook gently for 5 minutes.
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Mix in wine, lemon juice, and tomatoes with their juice.
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Allow sauce to come to boil, lower heat and simmer for 15 – 20 minutes, or until thickened, stirring occasionally.
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Cook and drain spaghetti. Mix in half the sauce and serve with rest of sauce spooned over top. Sprinkle with parmesan cheese.