Cook the pasta in salted water until al dente. Drain and rinse with cold water until cool.
In a bowl, stir together the noodles, the finely chopped onion, the drained corn, the lettuce and the dressing made from yogurt, ketchup and the spices. If possible, let it steep for about 2 hours, season again if necessary and serve.
Optionally, you can add chopped tomatoes, diced cheese and boiled ham, as well as fresh parsley and a little vinegar and oil to this salad.