5No Ketchup. Ever.

This might seem obvious, but for the sake of pasta dignity, it must be said: ketchup is not a pasta sauce. Using it as a substitute for tomato sauce is considered sacrilege in Italy — a culinary sin of the highest order.
If you’re in a rush, even olive oil and garlic tossed through warm spaghetti is preferable. Real tomato sauce in Italy is made with peeled tomatoes, garlic or onion, fresh basil, and patience. Ketchup has no place at the table.

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