Beat the sugar and the biscoff on medium speed with a stand mixer. Add the vanilla and a tiny pinch of salt. Once combined, add the milk and cream to the biscoff mixture, but do this SLOWLY or you will end up with a sloppy spilled mess. Once all combined and totally smooth you can chill for about an hour in the fridge and then pour into your ice cream maker and churn according the machine's directions. Freeze in a container until ready to eat.