THE WALMART IN PLATTSBURGH, New York, is a far cry from the fish markets of Montego Bay, but 1,800 miles from home, Omar Thelwell is game to use what he has. Fish tea—a delicate Jamaican broth of fish and simmered vegetables—is a versatile dish, and if all you have is frozen tilapia, that’s just fine.
“At home I can choose my own fish, like snapper and parrot-fish, and get real onions, scallions, and spices,” Thelwell says in his mellifluous voice, over a WhatsApp call from his house in Jamaica. “In New York, we may not get what we wanted, but we work with it.” Plattsburgh may not have a dozen varieties of freshly caught fish, but it does have one ingredient you’re unlikely to find in Jamaica: ramps. And as…