Grandma's sponge cake

Ingredients for 1 servings:

• 200 g butter (room temperature)
• 200 g yogurt
• 250 g sugar
• 1 lemon(s) (zest and juice)
• 6 egg yolks
• 3 eggs
• 300 g flour
• 30 g cornstarch
• 1 packet of baking powder
• 4 pinches of salt
• 250 g powdered sugar
• 40 g lemon juice
• 20 g protein
• some chocolate decoration (drops)

Instructions

Working time approx. 15 minutes; Cooking/baking time approx. 45 minutes; Total time approx. 1 hour

Cream the butter, yogurt, sugar, 3 tablespoons of lemon juice, and lemon zest with a hand mixer until creamy. Gradually beat in the egg yolks and eggs. Sift the flour, baking powder, cornstarch, and salt over the mixture and mix everything into a smooth batter. Pour the batter into a greased ring tin and bake in an oven preheated to 175°C for about 45 minutes. Remove from the oven, let rest for 10 minutes, then turn out onto a wire rack to cool. For the glaze, mix together the icing sugar, lemon juice, and egg white and spread over the cake. Sprinkle the chocolate chips over the glaze.