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1
Infuse the Milk
8 Mins
Medium heat, about 80°C (175°F)
Put the milk, both zests and the cinnamon stick in a pan over medium heat and warm it until it just begins to steam, about 5 minutes. Take it off the heat, cover and leave it for 5 minutes so the citrus and cinnamon perfume the milk, then fish out the cinnamon stick.
Never let the milk boil; boiled milk tastes flat and can scorch on the bottom of the pan.
Done when: The milk smells of lemon and cinnamon and steams gently.
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2
Whisk the Yolks and Sugar
3 Mins
No heat
Whisk the yolks with the 100 g of sugar and the cornstarch until the mixture is pale, thick and smooth, about 2 minutes. The cornstarch should be fully dissolved with no white streaks left.
Whisk until the mixture falls from the whisk in a slow ribbon; that is the sign the sugar has dissolved.
Done when: A pale, glossy mixture with no grit or streaks.
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3
Cook the Custard
8 Mins
Low heat, about 80°C (175°F)
Pour the warm milk into the yolk mixture in a slow stream, whisking all the time, then pour everything back into the pan. Cook over low heat, stirring constantly with a wooden spoon, for 5 to 6 minutes until the custard thickens enough to coat the spoon. Take it off the heat the moment it coats; do not let it boil.
Stir in figure-of-eights so the corners of the pan get scraped too; custard catches first in the corners.
Done when: The custard coats the back of a spoon and leaves a clear line when you run a finger through it.
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4
Chill Until Set
2 Hours
Fridge, about 4°C (39°F)
Pour the custard into the six dishes, let it cool for 20 minutes, then cover with cling film pressed onto the surface and chill in the fridge for at least 2 hours until fully set. The custard should tremble slightly when you shake the dish, not wobble like liquid.
Film on the surface stops a skin forming while the custard chills.
Done when: The surface is set and just trembles when shaken.
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5
Caramelise the Sugar Top
4 Mins
Blowtorch flame, about 1300°C (2372°F)
Just before serving, blot any moisture from the custard surface, sprinkle 10 g of sugar evenly over each dish and caramelise it with a kitchen blowtorch, moving in slow circles until the sugar melts into an even amber glass. If you have no torch, slide the dishes under a very hot grill for 2 to 3 minutes, watching constantly. Let the top harden for 2 minutes, then serve.
Caramelise at the last minute; the sugar top softens and weeps if it sits in the fridge.
Done when: An even amber crust that cracks sharply when tapped with a spoon.
auto_awesome Finishing Touches & Plating
Serve the crema cold, straight from the fridge, with the caramel top cracked at the table and a carquinyoli biscuit on the side.