The lemoney taste in Thai food is not just Lemon grass as many might believe, but also Kaffir Lime.

Kaffir Lime is the king of citrus fruit, not for it's flesh as this is practically juice free, but for the zingy zest of it's bright green lumpy flesh. The leaves of the tree are finely chopped and added to many Thai dishes such as the famous Tom Yam soup.
The leaves also when finely chopped can be sprinkled raw onto salads.

Picture coming soon.