This recipe calls for ground saffron, which is different from saffron strands (threads). If using saffron strands, make sure to grind them first with a mortar and pestle before measuring. Sprinkling ground saffron over ice cubes gives it enough time to bloom while the ice melts. Keep any excess saffron water in a small jar or bottle and refrigerate for up to 3 days. Two tablespoons of kosher salt in the water for the rice might seem like a lot, but that’s the amount you need to make sure the rice is flavored. Most of the salt will be washed off when you rinse the drained and parboiled rice.