I gently heated the double cream, whole milk, and orange zest together until warm. After removing it from heat, I let it sit for about an hour so the citrus oils fully infused into the dairy.
Once infused, I whisked the ricotta into the cream mixture and reheated it gently. This step helps blend the ricotta smoothly into the base without curdling.
In a separate bowl, I whisked the egg yolks and caster sugar until pale and creamy. This creates the foundation for a rich and stable custard.
I slowly poured the warm dairy mixture into the egg yolks while whisking constantly. Then I returned everything to the saucepan and cooked it gently until slightly thickened.
After removing from heat, I strained the custard to remove the zest and any lumps. I chilled it in the refrigerator for at least four hours to ensure proper churning.
Once fully chilled, I churned the custard in my ice cream machine until thick and creamy. Near the end, I added the chopped dark chocolate so it stayed evenly distributed.
I transferred the ice cream to a freezer-safe container and froze it for several hours until firm enough to scoop beautifully