Lemongrass, more well-known as a seasoning used in Thai and Vietnamese cooking, is also frequently included as an ingredient in herbal tea or flavored tea blends. It can also be used on its own to make an herbal tea, and I've found it quite pleasant for this use.
I've noticed that lemongrass has a particularly persistent flavor, however. When I brew an herbal infusion of straight lemongrass it in a teapot or using a tea infuser, even when I thoroughly clean the pot or infuser, the characteristic hints of lemongrass linger in whatever tea I brew subsequently.
I just did this with Teatulia's Lemongrass (which I was quite impressed by--link is to my review). Now I'm drinking Amber Oolong Select from Upton Tea Imports, and there is still a noticeable lemongrass flavor present.
I wonder why this is the case? Has anyone else noticed this? Any other ingredients you've found that leave a lingering quality when you steep them in a teapot or tea infuser?