Remove the butter from the refrigerator in advance - it should not be too cold. Sift the flour through a sieve. Boil 1 egg and peel off the shell. Wash the dill. Turn the oven on 180 degrees. Place all the ingredients for the dough near the stove.
Prepare the dough for homemade eclairs. Combine milk and water in a saucepan, add salt, sugar and butter. Place on the fire and bring to a boil. Then reduce the heat and add flour. Stir the flour with a spatula until it boils and the mixture becomes thick and homogeneous. Evaporate excess liquid by constantly stirring the dough. Remove the pan from the heat and cool the dough slightly. Add the eggs into the dough one at a time, stirring them in with a spatula. Place the finished dough into a piping bag.
Add eggs to the dough. Let the dough cool in another container, otherwise the eggs will curdle when you add them. In a bowl, beat all the eggs and add them to the dough in parts, stirring constantly. The eclair dough should flow off the spatula.
Prepare for baking. Line a baking sheet with parchment to prevent the eclairs from sticking. Pipe eclairs about 11-12 cm long. Bake for 30 minutes at 180 degrees.
Prepare the filling. Grate the egg on a fine grater, and also finely grate the cheese. Chop the dill. Mix the filling, add mayonnaise and stir.
Fill the eclairs. Cut the side of the eclairs not all the way and fill with filling.
To make the presentation spectacular, place fresh lettuce leaves on a plate, and only then place the eclairs on them.