Sultanas are produced from varieties of seedless grapes, dried to concentrate their rich flavor. The sultana was traditionally imported to the English-speaking world from the Ottoman Empire. Sultana raisins can be added to you cakes, muffins, trail mix as well as tagines, salads and couscous. Eating sultana raisins regularly can help ease or prevent constipation, according to MedlinePlus. Raisins are a good source of dietary fiber, which is beneficial when you're constipated.