If your yogurt is sweet, let it sit at room temperature or in the fridge for a day to sour. The sourer it gets, the better your Qareh Qoroot will be. Don’t worry if it starts to bubble; that’s a good sign.
Pour the yogurt into a pot and stir until smooth.
Add water and stir well until fully mixed.
Place the yogurt-water mixture over medium heat and bring it to a boil. Once it boils (this can take about 15-30 minutes), let it continue to cook for 15 minutes until it curdles.
Do not stir it during this step, as stirring will prevent it from curdling. You’ll see the yogurt gradually separating from the edges of the pot.
Turn off the heat and let it cool slightly.
Place a strainer over a pot, put a clean cloth or bag over the strainer, and pour in the curdled yogurt mixture.
Gather the cloth and tie it. Let it drain for 8-12 hours.
You’ll find soft kashk inside the cloth, which you can taste and add salt if needed.
Shape the kashk into small balls, place them in a basket, and let them air-dry for at least a day in the sun.
Qareh-Making Step: Take the remaining water left in the pot and cook it on heat, gradually evaporating the water until the color turns cream to brown, which takes 20-30 minutes. Stir occasionally to prevent sticking or burning.
Once it reaches your desired thickness, turn off the heat. I like it a bit thinner to avoid bitterness from overcooking. Once cooled, store in an airtight container in the fridge.