half a lemon, peel only, grated
145²µ/5ΒΌ΄Η³ϊ plain flour
30g/1oz plain flour
220g/ 7Β½oz caster sugar
1 cinnamon stick
pinch of salt
ΒΌ tsp vanilla extract
100g/3Β½oz unsalted butter, softened
6 free-range egg yolks
300ml/10fl oz full-fat milk