Boil eggs in boiling water for about 10 minutes until hard. In the meantime drain the tuna. Clean and wash the salad, dab dry and tear a little smaller. Wash, clean and slice the tomatoes.
Finely dice the gherkins. Peel and finely dice the shallot. Wash parsley, dab dry and chop finely. Mix yoghurt, mayonnaise, cucumber and parsley. Season with salt, pepper and sugar.
Drain the eggs, rinse with cold water, peel and slice. Cut the ciabatta rolls horizontally. Spread 1-2 tablespoons of the tartar sauce on each base. Lay lettuce, tomato and egg slices and tuna alternately on top.
Jweils a blob of tartar sauce on it. Place the top half of the roll on top. Arrange on plates and serve garnished with chives.