Sweet Yogurt Sundae with Saffron and Pistachios

Yogurt makes a simple and attractive sweet course or cooling snack-treat. This version of sweetened yogurt from Bengal is called mishti doi, doi being Bengali for “yogurt.” The yogurt drains for an hour to lose its bitter whey and to thicken a little, then it is blended with jaggery (palm or crude sugar) and flavorings. Use good whole-milk yogurt, preferably organic. Serve in small bowls or tall sundae glasses and top with pistachios, or with pomegranate seeds or chopped toasted almo