Heat a medium pot over medium-high heat. Add olive oil and tomato paste, stir and cook for 1-2 minutes, until the tomato paste turns a deep red and starts to caramelize. Add passata, onion, garlic and salt. Bring to a boil, reduce heat and simmer, partially covered for 20 minutes, stirring occasionally.
Discard onion and garlic. Stir in sugar and basil.
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