“I’m stuck here,” Singh said one Tuesday afternoon, gesturing around the small Indian pizza shop where he works. His friend and co-owner of Tadka Indian Restaurant, Pizza and Sports Bar on 24th Street near Treat will be out of town, so Singh will be holding down the fort through Christmas this year. Yes, they will be open. Singh is Sikh, the world’s fifth-largest religion, which hails from India’s Punjab region. But he still celebrates “the regular stuff” for Christmas: “Gifts and trees, party, drinking. Hangover after,” he shrugs. Where many practicing Sikh men might wear a turban to cover their hair, he dons an oversize beanie.