Clean and wash the rhubarb and cut it diagonally into pieces about 1 cm long. Cream soft fat, 250 g sugar and salt with the whisk of the hand mixer. Stir in 4 eggs one after the other. Mix flour and baking powder and stir in alternately with the milk. Grease the fat pan of the oven (approx. 32 x 38 cm) and spread the dough evenly on it. Spread rhubarb on top.
Bake in the preheated oven (electric cooker 175°C/ convection oven: 150°C/ gas: level 2) for approx. 50 minutes. In the meantime, mix 2 eggs, sour cream and 4 tablespoons of sugar with the whisk of the hand mixer. After 25 minutes pour the icing over the cake. Take the cake out of the oven and let it cool down. Cut into 18 rhombs and decorate with meringue and rhubarb strips