Heat cream and vanilla pod in saucepan, do not allow to boil
Remove vanilla pod, rinse and store.
Beat egg yolks and sugar in large jug until pale yellow and slightly foamy.
Add warm custard to egg yolk mixture.
Place 4 large or 6 small ramekins in a large roasting tin, add hot water to half way up sides of ramekins, pour custard into ramekins, drop in a few summer berries (if using), and bake for 15 – 20 minutes.