Cook the pasta in salted water according to the instructions on the packet.
Cut the onions into large pieces and fry them in a pan with a little oil, but only briefly, they should remain crisp. Add the glass of pesto rosso and mix with the cream. Stretch the sauce with a little milk and add the soy sauce. The sauce may need to be thickened again. Cut 8-10 black olives into rings and add to the sauce.