Former nightclub owner Barry Blair is trying his hand at a new gig, entrepreneur. The one-time owner of Barry’s Nightclub in Warwick is pitching the Prep N’ Pop, the sole product being sold under the Doodads LLC brand that Blair began in 2007. The kitchen utensil peels a potato hands-free and then pops the potato out of its cylinder. He says he has sold tens of thousands of the utensils on QVC, where it retails for $17.25. Prep N’ Pop recently made its retail debut at the East Side Marketplace, which is serving as sort of a test run for larger grocery-store chains.