First make a Guinness® West Indies Porter reduction by boiling and then simmering with the golden syrup until the texture thickens. In a separate pan, bring the cream, milk and vanilla to the boil.
Next, place the 4 whole eggs, 3 egg yolks and caster sugar in a bowl and whisk.
Allow the mixture to cool before adding to the eggs and sugar. Churn the mixture in an ice cream machine, only half filling the barrel as the mixture rises. Scoop out into a metal container and freeze immediately.