flour and stir, cooking until its browns a bit, 3-4 minutes. add the curry powder, stir, and cook and additional minute. add the shrimp broth a little at a time, stirring after each addition to keep it smooth; the sauce will not become extremely thick, but creamy. Add the shrimp, salt and pepper, and lemon juice. Cook until the shrimp are hot., 2 minutes, and serve immediately, over white rice.