Sir in flour, sugar, curry powder, broth and celery. Cook and stir until thick (you can vary the amount of flour/broth to suit your taste).
Simmer --try not to let the onions and celery become mushy.
Just before serving, I add white raisins and dried McIntosh apples. They add another layer of flavor and a chrispy texture. You may want to serve with a long grain wild rice. Also side dishes of crushed salted peanuts, chopped green pepper, chopped egg whites, crumbled cooked egg yolks, or toasted coconut flakes to be sprinkled on top!