Place the 3 dl of the milk together with the 2 dl of cream into a sauce pan and put on a low heat. Add the chopped thyme and the lemon zest in and bring close to the boil. Turn of the heat and leave to stand for at least 30 minutes.
Once the half hour is over you can whisk the egg yolks with the sugar to a creamy and thick consistency. Add your herb/cream mixture in and the orange juice and whisk until light and airy. Whisk the remaining 2 dl cream to soft peaks and fold this through the herbal mixture.
Prepare the ice in an ice cream machine if you have one or put into a freezer bowl. Put this in the freezer and stir every 30 minutes or so until the ice is firm.