Place 1 paper baking tray in each of the recesses of a muffin tray (for 12 pieces). Drain the apricots and pat dry
Separate eggs. Beat the egg white and salt until stiff, adding 50 g icing sugar. Beat the egg yolks, oil, 100 g icing sugar, vanillin sugar and lemon zest with the whisk of the hand mixer for about 2 minutes until creamy. Stir in the soured milk briefly. Mix flour, starch and baking powder and stir in alternately with the beaten egg whites using the whisks of the hand mixer.
Fill the dough into the moulds. Place 1 apricot half on top with the convex side facing upwards. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for about 25 minutes. Let cool in the muffin tray for about 5 minutes. Then remove from the trays and allow to cool completely. Dust muffins with icing sugar shortly before serving