Melt the butter. Mix flour, milk, egg and 1 pinch of salt with a whisk to a smooth dough. Stir in liquid butter. Let the dough swell for about 15 minutes.
Heat 1 teaspoon of oil in a small coated pan (approx. 18 cm Ø). Pour in 1/3 dough and bake at medium heat for 1-2 minutes on each side until golden brown. Remove and bake 2 more crêpes in 2 tsp. oil from the remaining dough.
Let it cool down.
In the meantime, sort out the salad, wash and drain. Mix yoghurt, mustard and honey. Season to taste with a little salt. Wash the dill, shake dry and chop finely. Cover each crêpe with 2 slices of salmon.
Sprinkle with some dill and roll up firmly. Cut into pieces. Arrange the rolls with salad and some sauce. Add the rest of the sauce.