Combine butter, water, and salt in a pot and bring to a boil.

Add sifted flour to the boiling mixture and stir until fully incorporated and cooked.

Gradually add eggs to the hot dough, stirring until the mixture is smooth and elastic.

Pipe the dough into 2cm diameter balls onto a baking sheet and spray with water.

Bake in a preheated oven at 210°C for 18 minutes.

Melt chocolate in a piping bag using a double boiler.