Preheat the oven to 200oC and grease a baking tray.
Heat the water, butter, and sugar in a pan until the butter melts. Then tip in all the flour whilst beating with one hand and then remove the pan from heat. Continue to beat – hard – until you have a ball of dough that pulls away from the sides of the pan. Allow the pan and dough to cool a little.
Beat the eggs in a separate dish in the meantime. Add a little of the egg at a time and beat until fully combined before adding the next bit. Continue until you have a smooth paste which just drops from the spoon.
Either spoon or pipe the pastry onto the tray and put into the oven. Throw some water into the roasting tin before closing the oven; this will create more steam and will help the pastry to rise (in theory!)
Bake for 25 minutes until golden-brown. Pierce or slice buns (depending on whether you want to keep them whole) and allow to cool on a rack.
Whip the cream and fill the buns.
Make a chocolate ganache with melted dark chocolate and cream, or a chocolate sauce with sugar syrup and melted chocolate, and smother the buns.
If they are pretty, serve proudly and guard jealously. Otherwise, get stuck in!