Separate the eggs and beat the egg whites with a pinch of salt until stiff.
Mix the yolks with the xucker. Now add the egg white powder, the quark, the lemon juice and the lemon zest to the yolk mass. Mix everything into a smooth batter and then carefully fold in the egg whites, do not stir. The consistency is fluffy.
Grease 4 casserole dishes and sprinkle with Xucker. Divide the dough between the 4 molds and place on a baking sheet filled with warm water. The molds should be 1/3 in the water.
The soufflé is baked at 180 ° for 20-25 minutes. It should turn a light golden yellow color.