Add honey and salt and beat with a hand mixer until the egg white and yolks are well blended.
Add half the milk and stir constantly with a heat proof spatula over medium low heat until the mixture coats the back of a spoon or 160 F. Do not allow it to come to a boil.
Place a large heat proof bowl into ice water and pour the mixture through a fine sieve into the bowl. Add remaining cold milk. Add flavouring and stir to cool. Pour into jars with lids and refrigerate for up to a couple of days.