Wash and clean the cucumber and cut into thin slices. Season with 1 pinch of salt, mix well and leave to stand.
Wash the salmon, dab dry and season with salt. Heat 1 tablespoon of oil in a frying pan and fry the salmon slices for about 3 minutes on each side. Take out.
Wash dill, shake dry, pluck flags from the stems and chop. Put the egg yolks, mustard, vinegar, sugar, dill and 150 g oil into a narrow, tall beaker and stir with a hand blender at the lowest setting until a mayonnaise is obtained. Season to taste with salt and pepper.
Clean or sort the rocket, wash and shake dry. Halve the avocado, remove the core, remove the flesh from the skin and cut into slices. Spread slices of bread on one side with approx. 25 g cream cheese each. Cover 4 slices of bread on the cream cheese side with approx. 1/4 each of avocado, cucumber, fish, while lightly chopping, mayonnaise and rocket. Season with pepper and cover with remaining slices of bread.