Heat the oil in a small frying pan over low heat. When hot, add the caraway seeds and chili powder and cook for 3 to 4 minutes. Add the shrimp, mustard, salt, and lemon juice and stir well. Cover the pan and cook for 5 to 6 minutes. Stir the mixture well and serve with saffron pilaf, a basic rice pilaf laced with saffron and a green salad.