Preheat the oven to 160°C (fan 140°C) and line the base of a springform tin.
Separate the eggs while cold. Allow them to come to room temperature.
4–6 large Eggs
Whip the egg whites until soft peaks form. Add a pinch of cream of tartar or a few drops of lemon juice to stabilise.
100–150 g Sugar, 1 tsp Lemon zest/vanilla, 1/2 tsp Cream of tartar
In a separate bowl, mix the yolks with sugar until pale and thick. Incorporate yoghurt, melted chocolate, or honey depending on your variation.
150 g Greek yoghurt, 200 g Dark chocolate, 2 tbsp Honey, 1 tbsp Cornflour
Fold the whites gently into the yolk mixture using a metal spoon or silicone spatula. Work in thirds to maintain volume.
Pour the batter into the prepared tin and level the top.
Bake for 25–40 minutes, depending on the variation. The centre should be just set and the top lightly browned or cracked.