1. Blend the caster sugar, cofnflour, plain flour and milk together in a 1.5
litre bowl, mixing well with a whisk.
2. Microwave at 100% (high) for 7 - 7.5 minutes until thick, stirring
vigorously with a hand whisk every 2 minutes
3. Lightly beat the yolks in a separate bowl and mix in 6 tablespoons of the
hot custard. Blend thoroughly, then stir the yolk mixture into the
remaining custard.
4. Microwave for a further 1-2 minutes or until thick.
5. Beat in the butter and vanilla flavouring, then cover with cling film or
greaseproof paper. Leave to cool
