Separate the eggs.
Add sugar to the egg whites and whip until stiff peaks form.
Add sugar to the egg yolks and mix well.
Fold the meringue into the yolk mixture in three parts, gently mixing each time.
Heat a pan and lightly grease with butter.
Place the batter in the pan, cover with a lid, and cook on low heat.
Transfer the finished soufflé onto a plate.