Three to four stalks of lemongrass yield about 1/2 cup when chopped, which provides sufficient seasoning for a meat, fish or vegetable dish that serves four people. Since its flavor is so strong, you’re not likely to eat much lemongrass at one time, but you’ll still gain nutrients from even a small amount. One tablespoon of lemongrass has .4 milligrams of iron. That’s 5 percent of the recommended daily intake for men and 2 percent for women. The same portion also has 1 percent of the recommended daily intake of folate, potassium, magnesium, zinc and phosphorus. Lemongrass has vitamin C, vitamin B-6, riboflavin and niacin, but you’d have to eat an entire cup to gain a significant amount of these nutrients.