Ash or aush is a thick Iranian and Afghan noodle soup that can be made in numerous ways. The basic ingredients are always the noodles, along with garlic, tomatoes, different herbs and spices (mint being the most prevalent), and strained yogurt that is either dolloped on top of the soup or stirred in at the end.

There are numerous varieties throughout the broader region (including Azerbaijan, Türkiye and Pakistan), from the meatless ones made with various legumes such as beans and chickpeas, over the ones combining noodles, vegetables, and meatballs, to such versions as aush-e-asli, consisting only of noodles and meatballs, made from either lamb, or the more traditional beef meat.