レアチーズケーキ: Does 「レア」 originally come from "rare" or from "layer"?


レアチーズケーキ is a kind of cheesecake which is not baked.

What is the etymology of the レア part of this word?

Academic references needed, as this is a controversial topic:

  * The [top Google result](http://www.homemate.co.jp/useful/english/wasei/dish/index04.shtml) claims it comes from "layer"
  * [ALC](http://eow.alc.co.jp/search?q=%E3%83%AC%E3%82%A2%E3%83%81%E3%83%BC%E3%82%BA%E3%82%B1%E3%83%BC%E3%82%AD) claims it comes from "rare"

![レアチーズケーキ](https://i.stack.imgur.com/pDdR2.jpg)




大辞林 as well as 大辞泉 say

> レアチーズケーキ [和 rare + cheesecake]

so I'll say presumed "rare" until proven otherwise.

