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Heat the oil in a large skillet over a medium flame. Add the onions and saute until soft.
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Add garlic, olives, capers, red pepper flakes and oregano to the skillet, and saute for 2 minutes more.
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Add the tomatoes and parsley and simmer until sauce is thicken slightly. Season with salt and pepper.
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Serve with pasta (like spaghetti) and grated Parmesan cheese.