Green nira grass has a distinctive pungency that adds richness to stir-fry dishes. The tough ends of the nira grass are chopped off and the rest is eaten in various Asian recipes. Yellow nira grass has a distinctive, mildly onion flavor. Its yellow color and mild taste come from being grown out of direct sunlight.
These fine leaves don't last a long time so it's best to use them within a couple of days of purchase. You can store any unused nira in a damp paper towel for a couple of days.
You can find this product at some Whole Foods markets as well as your local Asian market if you have one nearby. You can also purchase it from Melissas.