Method

• 1.
  Preheat oven to 180°C. Grease the madeleine pans.
• 2.
  Place the eggs and sugar in a bowl over a saucepan of simmering water and whisk continuously until pale and doubled in volume.
• 3.
  Remove from heat and carefully fold in the flour, lemon zest and butter. Spoon into the pans and bake in the oven for 12-15 minutes.
• 4.
  Transfer to a wire rack to cool slightly. Serve dusted with icing sugar.