Defrost the peas. Cook 8 eggs in boiling water for about 10 minutes. In the meantime wash and clean the spring onion, dab dry and cut diagonally into rings. Put something aside for sprinkling.
Lightly heat 1 tablespoon of oil in a small saucepan. Sweat curry powder in it for about 1 minute. Remove the pot from the heat, let it cool down briefly, stir in yoghurt and salad cream. Season with salt, pepper and sugar.
Peel and wash the potatoes and grate them roughly in a bowl. Season with salt and put aside for a short time. Quench eggs in cold water, peel and cut into slices with the egg slicer. Drain tuna and pluck fillets roughly.
Mix eggs, peas, tuna and spring onions. Fold in salad cream, season again. Squeeze the potatoes well over a sieve and place in a bowl. Stir 1 egg into the potatoes and season with salt and nutmeg.
Heat 4 tablespoons of oil in a pan and fry about 20 small Rösti over medium heat until golden brown. Keep the finished Rösti warm. Arrange 4-5 Rösti with the egg salad on plates.
Sprinkle with remaining spring onions and some pink berries, garnish with parsley.