Whisk the half and half, cream and egg yolks and reserve.
If you're using regular sugar instead of maple syrup, skip to step 4.
Heat the maple syrup in a 2 quart capacity sauce pot and bring to a simmer. Add the black raspberries, turn the heat to medium and cook, mashing the fruit up with the back of a spoon until the mixture comes back to a simmer.
Simmer the fruit and maple syrup for 3-4 minutes on medium heat to evaporate some water.
Add the cream-egg mixture, stir, then puree the mixture with an immersion blender and cook until the mixture is visibly steaming and slightly thickened (roughly 168-170 F).
Strain the mixture through a fine strainer or chinois.
Add the lemon zest and wild vanilla extract, cool, then refrigerate in a container with a lid overnight for the best texture.
Spin the ice cream according to the manufacturers directions of the ice cream machine.
Serve the ice cream drizzled with a thread of maple syrup, extra fresh black cap raspberries and a sprig of mint if you have some.
Video
Notes
The recipe works fine as written and stays creamy made with only maple syrup. But, you can substitute ¼ cup corn syrup for ¼ cup of the sugar or maple syrup to hedge your bet and ensure the ice cream is extra smooth and creamy.