Reference for Chullin 238:5

אמצעית שלמה מצטרפת קדורה אין מצטרפת

Behold we have learnt: R'Judah says: An onion has three skins: the innermost skin, whether it is entire or has holes in it, is reckoned together [with the edible part]; the middle skin, if it is entire, is reckoned together, but if it has holes in it, it is not reckoned together; the outermost skin in either case is clean!<span class="x" onmousemove="('comment',' V. 'Uk. II, 4. The innermost skin is regarded as part of the onion for it is edible, the middle is a protection and therefore can serve as such only when entire, the outermost as a protection over a protection which can in no circumstances be reckoned together with the foodstuff. rnua');">²</span>

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow