Place the chiles, walnuts, garlic, and salt in a food processor and process until the mixture resembles chunky peanut butter, scraping down the sides as necessary to make sure everything gets well blended. Transfer to a medium glass or ceramic bowl and gently stir in the yoghurt. Toss with pasta or serve as a condiment with grilled meats.

*Wear gloves when seeding and slicing chiles and take care not to touch eyes or sensitive skin.

Makes about 3 cups.