Choose whole fresh walnuts, crack open the shells, take out the kernels, weigh them and then peel them with a small sharp knife. Chop them up roughly on a board. Bring the milk to the boil in a saucepan, add the walnuts and leave to infuse for 10 minutes just off the heat.
Mix the egg yolks with the honey in a bowl and beat with a whisk for at least 5 minutes.