Step 1 Whisk the egg yolks and sugar in a medium bowl until pale. Step 2 Bring the cream, milk and vanilla to a simmer in a saucepan over low heat. Step 3 Whisking continuously, pour the cream mixture into the egg yolk mixture to combine. To test, dip the spoon into the custard and draw your finger through the mixture on the spoon. Step 5 Strain into a bowl and whisk occasionally until cool.