In August 2020, 46-year-old Natasha Kazmi returned from Virginia to Karachi, the city she had left when she was 19. Even as she built a life and raised two daughters in the United States, she had longed to return to Pakistan, counting down every Friday until her next visit. She had little by way of a plan, but she arrived as a pâtissier trained at the Cordon Bleu and Bellouet Conseil in Paris. In October, a childhood friend asked her to bake something, and Kazmi made a chocolate-caramel entremet, which…