What is the name of part of onion we peel?

The term is skin. I helped my grandma grow onions as a kid and we were told to not tear the skin when picking.

The onion is a bulb.

The skin is the membrane on a layer.

Each layer has a skin, a membrane that wraps around the actual layer.

The layer itself is actually a leaf.

The very center does not have a name since it is just younger leaves growing out of the basal disc.

We peel the skin off the onion, then after that, we peel layers of the onion.

Once you get past the thin, dry, brown skin, the onion is composed of many layers.

We often use onion or peeling an onion as a metaphor for something that has many layers. For example, there is a system for browsing the web anonymously called Tor. Tor is an acronym for The Onion Router, which refers to the fact that all communications are wrapped in many layers of security.

I peel the layers of an onion. When I distinguish, I call the outer brown layer a skin and the inner are fleshy leaves. Unlike an artichoke, I never call the inner portion the heart. When making an analogy to the structure of an onion, such as in atomic chemistry, I may call them shells.

Skin, or husk if the onion is really old and the first layers are dried up, and layers for the meaty parts. I found the translation of the onion scene from Henrik Ibsen's Peer Gynt.

[Takes an onion and peels it, layer by layer] There's the untidy outer husk ;

That's the shipwrecked man on the wreck of the boat ; Next layer's the Passenger, thin and skinny- Still smacking of Peer Gynt a little. Next we come to the gold-digger self; The pith of it's gone some one's seen to that. This layer with a hardened edge Is the fur-hunter of Hudson Bay. The next one's like a crown. No, thank you ! We'll throw it away without further question. Here's the Antiquarian, short and sturdy ; And here is the Prophet, fresh and juicy ; He stinks, as the saying goes, of lies Enough to bring water to your eyes. This layer, effeminately curled, Is the man who lived a life of pleasure. The next looks sickly. It's streaked with black. Black may mean missionaries or negroes.

[Pulls off several layers together.]

There's a most surprising lot of layers! Are we never coming to the kernel ?

[Pulls all that is left to pieces.]

There isn't one ! To the innermost bit It's nothing but layers, smaller and smaller. Nature's a joker !

(Point is, he never gets to the kernel, or core, since there is none in an onion. Existential angst expressed through a vegetable - very nordic)