cauliflower (n.)youdaoicibaDictYouDict
1590s, originally cole florye, from Italian cavoli fiori "flowered cabbage," plural of cavolo "cabbage" + fiore "flower" (from Latin flora; see flora).

First element is from Latin caulis "cabbage" (originally "stem, stalk") which was borrowed into Germanic and is the source of cole in cole-slaw and of Scottish kale. The front end of the word was re-Latinized from 18c.; the back end was influenced by flower (n.). The boxer's cauliflower ear is from 1907.
coleslaw (n.)youdaoicibaDictYouDict
also cole-slaw, cole slaw, 1794, American English, partial translation of Dutch koolsla, from kool "cabbage" (see cole) + sla "salad" (see slaw). Commonly cold slaw in English until 1860s, when Middle English cole "cabbage" was revived.
kale (n.)youdaoicibaDictYouDict
also kail, c. 1300, alternative form of cawul (c. 1200), surviving in this spelling after Middle English as a Scottish variant of cole "cabbage" (see cole-slaw). Slang meaning "money" is from 1902.