Put the eggs in boiling water and boil them hard for about 9 minutes. Drain, rinse and peel. Wash herbs, shake dry, put some chervil aside for garnishing, chop the rest finely. Cut chives into fine rolls, put some aside for sprinkling
Cut 1 egg into slices with an egg slicer, set aside. Dice remaining eggs with the egg slicer. Drain the cucumbers and collect 1 tablespoon of stock. Dice cucumbers finely, except for 4 pieces. Mix mayonnaise, yoghurt, curry and brew. Season with salt and pepper. Stir in eggs and gherkins. Season to taste with salt and pepper.
Spread the egg salad over the slices of bread. Garnish with egg slices and chervil set aside. Sprinkle with chives. Serve with the remaining gherkins