I'm not sure what parboiling is. I just gave them a light coat of olive oil, salt, pepper and granulated garlic and threw them on a perforated grill pan. Oil and herbs on the carrots.
I'm in Indianapolis, but I work with someone who's folks go to Wisconsin often. My sister used to live there, but moved back to Indiana. She's the one who introduced me to the Spotted Cow.
And, yes, Sean, I highly recommend the carrots. Crazy good stuff.
Always Learning.