Add the butter to 1 dl water and bring to the boil. Simmer slowly until the butter has dissolved. Add all flour at once, while the pan is on low heat, and stir well, until the dough forms a ball. Turn off the heat. Allow the dough to cool down for 10 minutes, then add the eggs, one by one. Mix well until smooth. Drop the dough with a spoon onto a baking sheet (makes 8 big puffs or 12 small ones). Bake for 30 minutes (or a little less for small ones) at 175 degrees Celsius. Turn off the oven and leave the puffs in for 10 Minutes. Cool on a rack. Fill with whipped cream, ice cream or custard.

This recipe has to be carried out exactly as described, otherwise the puffs will remain flat or weak.