Sprinkle salmon fillet with salt, massage well with your fingertips, wrap in foil and chill overnight
Wash the tomatoes, cut them in half, remove the seeds and cut into small cubes. Clean and wash spring onions and cut into fine rings. For the marinade, mix vinegar, lime juice, sugar, mustard powder and a little salt and pepper. Finally, fold in the oil
Cut salmon fillet into thin slices. Put tomatoes and spring onions in 4 glasses in layers and arrange the salmon slices on top. Pour marinade over it and serve everything well chilled
Waiting time approx. 12 hours