What is the definitive guide to finding the best ice cream in NYC according to Mommy Poppins?

I'm sorry for any confusion, but the documents provided don't offer a definitive guide to finding the best ice cream in NYC according to Mommy Poppins. They do suggest that Mommy Poppins has shared some favorite cold treats and places to go on National Ice Cream Day in NYC, but specific recommendations or a comprehensive guide aren't mentioned. If you're interested in more details, I'd recommend checking out Mommy Poppins' Instagram page or website for more information. Is there anything else you'd like to know about?