Sohan is originated in Qom, Iran.There are different types of Sohan including Honey Sohan, Sesame Sohan, Sohan Halwa, Almond Sohan, Sohan Gazi, Sohan Loghmeh, Butter Sohan, Sohan Pashmaki (cotton candy) and Dessert Sohan. Some people believe that when Naser al-Din Shah Qajar travelled to Qom and he was entertained with Halwa Qomi, he analogized it to a rasp (Sohan is the Persian word meaning rasp or file) which digested the food he had eaten very well.
