1: Preheat the oven to 390°F (200°C). Cut circles from the buckwheat pancake about 6 cm (2.3 inches) in diameter. You will need 3 circles for each feuillantine.
2: Melt 20 g butter then brush each circle with butter and salt on both sides.
4: Bake until they are just lightly browned (about 5 minutes). Set aside to cool on a wire rack.
5: Put 150 g crab meat and 150 g fresh salmon (lightly poached in a little salted water) into a bowl with 100 g mayonnaise, your choice of herbs (chives, coriander and parsley here) chopped finely and pepper.
6: Mix thoroughly.
7: Begin assembling the feuillantines: place a circle on the serving plate. Put a spoonful of filling on top.
8: Add a second circle and top this with another spoonful of filling.
9: Finish with the third circle. Make one feuillantine for each guest.
10: Serve without delay. If you have any mixture left over, try improvising a different presentation.
Remarks
If you do not have any buckwheat pancakes (galettes), you can use sheets of brik or filo. To keep the circles completely flat, place a second baking sheet on top before putting in the oven.