the first citrus fruit

In general, this fruit is very famous even now many on the market this time I take this photo from my own garden because the first citrus fruit there are benefits very much used in delicious cuisine also there are say this fruit is also for health and beauty. Skin is also to tighten the face, but I pingin show to my friend that this is the first fruit found in the belly of this tree dagger I've been looking for another yes there is not just one wrote

in this fruit there is a juice of water that is very surly when exposed to eyes o very poignant so it must be washed with plenty of water