
Place the eggs, extra yolks, vanilla seeds, vanilla extract and sugar in a heatproof bowl.
Place over a saucepan of simmering water and whisk the mixture for 4-5 minutes or until heated through and frothy. Remove from the heat and beat with an electric mixer until pale and thick.
Pour the mixture into a metal bowl or cake tin. Cover the bowl or tin with foil and freeze for 4-6 hours or until firm. Serves 6-8.