Pour the milk and cream into a pan and add the vanilla and lemon rind. Bring to the boil, then turn off the heat immediately and leave to cool for 15min.
Step 2
In a bowl, whisk together yolks, sugar and cornflour. Gradually whisk in cooled milk mixture, then put the bowl over a pan of simmering water, making sure the bottom of the bowl doesn't touch the water.
Step 3
Heat gently for 10min, stirring continuously until the mixture thickens and coats the back of a spoon easily. Pour into a jug and serve immediately.
Follow the recipe to the end of step 3. Pour into a jug and cover the surface with a round of greaseproof paper, then cover the jug with clingfilm and chill for up to a day.
To serve: Warm the custard in the microwave on medium for 2min, then microwave for a further 2min (based on a 900W oven).
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