Waiters cart around ramen noodle cacio e pepe, foie gras bratwurst, spicy tuna rolls and drinks in tiki cups as customers relax to pumping rhythm and blues at the late night dining services at UNI in Back Bay.

On an average weekday, Beth Wittenstein walks into the kitchens at 808 Commonwealth Ave. and starts cooking. She watches iconic Boston chefs and foodies carve, sauté and braise – and then she does it...