You can think of enchilada as one plate in front of you: a rolled around its filling, lying under a thick layer of red sauce, still whole and hot from the oven. It is one object, generous and complete, and you can see at a glance both how big it is and that nobody has taken a piece of it. Those two things you can see — its size and its wholeness — are what American speakers borrowed when they started using the word for something that is not food at all.
enchilada 可以想成眼前的一個盤子：一張玉米薄餅把餡捲起來，躺在一層厚厚的紅醬底下，剛從烤箱出來，還是完整的一整捲。它是一個很有份量、也很完整的東西。你一眼就看得出兩件事：它有多大，還有它一口都還沒被動過。美式口語後來借走的，正好就是這兩件看得見的事——大，還有完整。
From the word’s history
The name comes from Spanish enchilada, the past participle of enchilar, to add chilli. So the word does not name the bread or the filling; it names what is poured over the top.
這個名字來自西班牙文 enchilada，是動詞 enchilar（加辣椒）的過去分詞。所以這個字說的不是餅，也不是餡，而是淋在上面的那層辣醬。
Wiktionary, "enchilada"
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