8 egg yolks
Cream the egg yolks and sugar. Heat the milk and cream together - do not boil.
Pour a little of the milk mix into the egg yolks whilst whisking. Once you have done this to warm the egg yolks you can add the rest of the milk mix. Return the whole mix to the saucepan and heat until it thickens. Cool over ice. Add Kahlua.
Place in an ice-cream machine and churn. Serve in frosted glasses.