Boil pasta in plenty of boiling salted water until tender, according to package instructions.
While the pasta is cooking, cut the onion into thin half rings. In a separate skillet, sauté the onion, raisins and pine nuts in hot oil, 1 minute.
Mix tomato paste with vinegar, add to the onion mass. Mix thoroughly and simmer a little over low heat until the consistency of ketchup.
Divide the hot pasta among bowls, add the sauce and drizzle with olive oil. Serve right away