Technical Stages :

• Boil the milk with a vanilla pod spliced lengthwise.
• In a second bowl, whisk egg yolks and sugar until light.
• As soon as the milk starts boiling, pour on the yolks, whisking.
• Transfer back to the pot you used to boil the milk and cook over low (gas stove) or medium (electrical) heat and keep stirring with a wooden spoon until à la nappe.
• When finished, filter through a chinois sieve and transfer to a cold bowl, stirring frequently until fully cooled.