Peel and seed the cucumber then grate it over the finest side of the grater, then put it in a colander and sprinkle ¼ teaspoon of salt over and let it stand for at least 15 minutes. Then squeeze all the liquid out. Mix with the cream cheese and chives, season to taste with salt and pepper and keep in the fridge until use.
Spoon the cucumber cream cheese mixture evenly onto the lettuce leaves and top that with small pieces of the smoked salmon and then garnish with mini capers and / or salmon roe.