Kaleh joosh is a quick and simple vegetarian soup enriched with calcium and protein. It is originally from Yazd and Khorasan provinces of Iran, But it’s known all around the country and in every region the recipe has slight changes.

The main ingredients for this soup are walnut and Kashk (whey), which is a thick whitish liquid similar to sour cream. It is available as a liquid or in a dried form, which needs to be soaked and softened before it can be used in cooking. Kashk is traditionally produced from the leftovers of cheese-making process (more specifically, the milk used to make it) and is a byproduct of curdled milk (buttermilk). It can be found in any Iranian or Middle Eastern grocery stores.