Bring the water, butter, salt, and sugar to boil. Lower the heat and add flour. Stir well until combined and elastic.
Remove from heat.
With a mixer, mix until the mixture reaches luke- warm temperature and add eggs one by one, continue mixing until combined.
Once ready, put the batter into a piping bag with a tip, pipe lengthwise - 10 cm in size, on a baking tray and bake at 160° for approximately 50 minutes.
