POCATELLO — Businesswoman, entrepreneur and mother of three young children, Emily Stark, had what she calls “this crazy idea” to open a 24/7 commercial kitchen to rent out to anyone who needs a place to do major food preparation. After months of research and hard work, Stark recently opened the big overhead door to her sparkling clean new business, Portneuf Valley Commercial Kitchen, at 251 Tailwind Circle (#123) in Chubbuck. With the latest professional-grade equipment, including a 15-quart mixer, nugget ice maker, giant ovens and everything in between, the kitchen is already stirring up plen…