Picture something so good that your body leans toward it before you decide anything: the smell reaches you first, and you already want it in your mouth. That pull is the whole word. It sits most naturally on food and on smells, it can be turned around into a name for the good things themselves, and when it is aimed at a person it carries the same pull with it, which is exactly why that use raises .
可以想成：一樣東西好到你還沒決定，身體就先靠過去了。香味先到，你已經想把它放進嘴裡。這股「被拉過去」的力量，就是這個字的全部。它最自然的落點是食物和氣味。把它反過來當名詞用，就變成「那些好東西」本身。而當它被指向一個人的時候，同一股力量也跟著過去——這也正是那個用法讓人側目的原因。
From the word’s history
From Medieval Latin delectare, to delight, coming into English through Old French; by its parts it is delect plus -able, so it means able to delight.
來自中世紀拉丁文 delectare（使人愉快），經古法文進入英文；拆開看是 delect 加 -able，字面就是「能讓人愉快的」。今天這份愉快多半落在嘴巴和鼻子上。
Wiktionary, "delectable"
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