Polenta e osei

For the cake

• 45 g butter
• 75 g plain flour
• 45

Start by preparing the sponge cake. Preheat the oven to 170°C. Melt the butter and keep warm. Sift the flour and potato starch together. Break the 2 whole eggs into a heatproof bowl, beat them and then place over a pan of simmering water. Heat to 45°C, then remove from the heat. Add th