Cut the potatoes in half, put in a saucepan, cover with water and boil until tender. Then drain the water and dry the potatoes.
For the sauce, mix chopped dill, sour cream, horseradish, salt and pepper.
Cut the salmon into large cubes, sprinkle with salt and pepper, leave for 5 minutes.
Cut the onion into half rings, zucchini into small cubes.
Lightly fry the onion in olive oil, add the zucchini, fry for 2 minutes. Add potatoes and heat, stirring gently, 1-2 minutes.
Add fish; cook, stirring, 4-5 minutes, until fish is done. Sprinkle with lemon zest and pepper and serve immediately with sauce.