Bring water and oil together to boil and add the flour at once while stirring firmly
Keep on stirring until the batter becomes a ball which does not stick to the pan anymore (this takes a minute)
Turn off the flame and mix the eggs one by one into the batter
Oil a baking tray. Use 2 wet tablespoons to shape puffs and leave enough space for each of them
Baking:
Put the tray at the bottom of the oven on 180 °C for 20 minutes (position 5) so that the puffs can rise
Change the tray to the centre of the oven and bake 20 minutes on 200 °C (position 6)
Go back to 180 °C (postion 5) and bake another 10 to 20 minutes to get them well done inside
Cover after 30 minutes with tin foil if necessary