Clean lamb's lettuce, wash thoroughly and drain. Wash tomatoes, drain and cut in half. Halve avocado, remove stone. Peel avocado halves and cut into fine slices.
Peel and finely chop the onion. Mix vinegar, onion, dried dill, some salt and pepper. Add the oil. Peel horseradish, grate finely (50-60 g) and mix with lemon juice.
Whip the cream until stiff and stir in the horseradish. Season to taste with a little salt. Put the horseradish cream into a piping bag with a medium sized perforated spout. Halve the salmon slices and form into rolls over a finger.
Pour in horseradish cream. Briefly blanch 8 chive stalks and tie 1/2 lemon slice on each of 8 rolls. Cut the rest of the chives a little shorter and put 1/4 lemon slice on each of the remaining salmon rolls.
Arrange salmon rolls on 4 plates. Roast toast and cut out stars. Mix the salad ingredients with the vinaigrette. Serve salad and warm toast with the salmon rolls. Garnish with remaining lemon slices.