In a heavy bottomed saucepan bring the milk slowly to the boil.
In a jug whisk the egg yolks, vanilla and cornflour together until pale and fluffy.
Pour in the hot milk whilst whisking as you do. Transfer back to the pan and simmer until thickened and boiling.
Plunge the pan in cold water and allow to cool completely.
Once cold whisk in the quark and some food colouring if using, taste and see if it needs either more vanilla or sweetener and change to your tastes (bare in mind the taste will change once frozen so don’t over power it).
Pour the mixture into your ice cream maker and follow the instructions that come with it. You want the mixture to be the texture of what you would get from an ice cream van. (Either serve now or freeze for a firmer ice cream).
Transfer the ice cream to a freezer safe tub and freeze for up to 3 hours. Use a fork to beat it every hour to prevent any ice crystals forming.
Take out the freezer a few minutes before you wish to serve.
If you do not have an ice cream maker just simply put the ice cream in a freezer proof tub and freeze for up to 7 hours using a fork to beat every hour.
Please note freezer times can vary depending on freezer so you would have to use your own judgement on freeze times, times stated are accurate for our own freezer and should only be used as a guide.