Wash the basil, dab dry, pluck off 4 tips and put aside for garnishing. Remove the coarse stems from the rest. Roast the pine nuts in a pan without fat until golden brown. Peel garlic.
Prepare the pasta in boiling salted water according to the instructions on the packet. Puree basil, 50 g Parmesan, yoghurt, olive oil, 30 g pine nuts and garlic in the universal chopper, season with salt, pepper and a little sugar.
Drain the pasta and let it drain thoroughly. Put the pasta back into the pot, mix with pesto and arrange on preheated plates. Sprinkle with remaining pine nuts and parmesan and garnish with basil.