At an Asian supermarket, I purchased a fresh, giant aloe leaf for use as a
topical healer for burnt skin.

Since giant aloe leaves are always available at this store, I assume that
they have other uses than just as a healing gel for injured skin.

Is it used in cooking? What else is it used for?

This particular variety of aloe is extremely bitter.

Also, can a leaf be rooted in soil, or would I need to get a piece of a
whole plant with a bit of root attached? Where can giant aloe plants be
purchased (I live in northeastern USA). I have a beautiful aloe plant
growing in my home, but its leaves are only about a foot long. The leaf
that I purchased at the supermarket is about 2 1/2 feet long.

- David