Whisk egg yolks with yogurt, lemon zest, and juice.

Mix flour and cornstarch, then add to the yolk mixture.

Beat egg whites with salt until foamy, then slowly add sugar. Fold into the batter.

Pour into an 18 cm cake pan, place in a baking pan with hot water, and bake at 150°C for 60 minutes.

Let it cool, slice, and enjoy! Perfect for tea time or just a sweet treat! Let me know if you give it a go!