Creme Brulee

To make the custard

In a heavy-bottomed saucepan and over a low heat bring the cream, milk, vanilla and lemon zest to the boil. In a separate bowl, whisk together the egg yolks and sugar until the sugar has dissolved. Remove the vanilla bean and pour the hot creamy milk over the egg mixture, whisking all the time. As soon as the custard begins to thicken, p