Cook the pasta in boiling salted water according to the package instructions (approx. 10 minutes). Drain, rinse with cold water, drain on a sieve and allow to cool. Put egg yolk and mustard in a bowl. Season with salt and pepper.
Whisk with the whisk of the hand mixer for about 1 minute. First add the oil drop by drop (approx. 5 tbsp.), then slowly add the oil in a thin stream, stirring continuously. Fold in the yoghurt. Season mayonnaise with salt and pepper
Wash the tomatoes and cut into slices. Cut cabanossi into slices. Wash the rocket, dab dry and chop coarsely. Mix the pasta with the prepared ingredients and mayonnaise. Season once again