Set a box grater in a large bowl. Using the large holes, grate corn kernels (and their "milk") off the cobs. Discard cobs.
In a medium saucepan over medium heat, combine cream, milk, and corn. Bring to a simmer. Meanwhile, in a medium bowl, whisk sugar and egg yolks until pale and thick. When cream mixture reaches a simmer, slowly ladle 1/2 cup of it into egg mixture, whisking constantly. Repeat with another 1/2-cup ladleful. Reduce heat to low, whisk warmed egg mixture into saucepan, and cook, whisking, until mixture thickens a bit, about 5 minutes.
Pour mixture into a medium bowl, stir in vanilla, cover with plastic wrap (letting the wrap sit directly on the mixture's surface), and chill at least 2 hours and up to 1 day.
Freeze in an ice cream maker according to manufacturer's instructions. Serve immediately or transfer to an airtight plastic container and freeze up to overnight.
I had this in Brazil where it's called Milho Verde or green corn ice cream. it was smooth and creamy and wonderful.
I would puree the corn first hoping the result would not have chunks of the kernels in the ice cream.
My fiance actually made this, and I'm pretty sure he stuck to the recipe. He said that when the ice cream was finished churning, it tasted like a vanilla pudding. Now that it's been in the freezer hardening over the last few days, it definitely tastes more of corn (albeit a light flavoring), and it has a very creamy taste.
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