This weekend, tennis star Novak Djokovic is serving snackers something a little different: a new sorghum-based, corn-free “popcorn” brand called Cob, which will compete in the same aisle as SkinnyPop and Orville Redenbacher’s. The popcorn’s launch coincides with the announcement of a $5 million seed round for the startup that’s led by Djokovic.

Popcorn has become a particularly alluring category for celebrities over the past few years. New entrants have included Khloud Protein Popcorn backed by reality TV star Khloé Kardashian; singer Luke Bryan’s Boldly Grown Popcorn; and Rob’s BackStage Popcorn, cofounded by the pop rock band the Jonas Brothers.

Why popcorn?

What they are nibbling on is a growing market that’s welcoming to new brands that promote bolder flavors, avoid canola oil and a

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