Ragaa Abdalla prepares greens at Sanctuary Kitchen in New Haven, a place where she and others share their culture through food. (Kai Zhang / CitySeed)Ragaa Abdalla, surrounded by pots and pans, stuffs a squash with meat and rice. She is making mahshi, a traditional Sudanese dish, in a kitchen nearly 7,000 miles from home.Abdalla, who now works as a chef at New Haven’s nonprofit Sanctuary Kitchen, fled her home country seven years ago and fears f…