Deseed the vanilla bean and set the seeds aside.
In a sauce pan, warm up the milk, deseeded vanilla bean, vanilla bean seeds, and large pieces of lemon peel. Do not let it come to a boil. When steam starts to emit from the pan (just before boiling point), turn off the heat. Remove the vanilla bean and lemon zest. Vanilla bean can be discarded but keep the lemon peel.
Using a colander, strain the milk mixture, so that any extra bits of the vanilla bean (other than the seeds) can be filtered out.
In a bowl, lightly beat the egg yolks with a fork. Add the sugar and whisk with a hand mixer until light and creamy, a few minutes.. Add the flour to the bowl, and mix with the hand mixer off at first (or else flour will go everywhere!). Once mixed by hand, turn on the hand mixer and beat until flour is well incorporated.
Add a bit of the milk mixture to the egg mixture to loosen it up. Mix with the hand mixer.
Keep adding the milk to the eggs and mixing with the hand mixer until incorporated. The mixture should be foamy.
Pour the mixture back into the sauce pan, along with the lemon peel. Turn the heat to medium-low and whisk the mixture until a cream-like consistency forms, about 10 minutes. Remove the lemon peel.
Add the cream to a shallow dish and cover it with saran wrap, ensuring that the saran wrap touches the cream. This will ensure no bubbles form on the cream.
Let the cream cool at room temperature, then transfer it to the fridge.