fixings (n.)youdaoicibaDictYouDict
"apparatus," 1820, American English, from fixing "act of putting in order" (c. 1600), verbal noun from fix (v.). American English sense of "food, garnishing" is attested from 1839.
garnish (v.)youdaoicibaDictYouDict
late 14c., "to decorate, adorn, beautify," also in Middle English "equip (a place) for defense; arm (oneself) for battle; prepare to defend," from Old French garniss-, present participle stem of garnir "provide, furnish; fortify, reinforce" (11c.), from Frankish *warnjan, from Proto-Germanic *warnon "be cautious, guard, provide for" (cognates: Old High German warnon "to take heed," Old English warnian "to take warning, beware;" see weir, and compare warn).

Sense evolution is from "arm oneself" to "fit out" to "embellish," which was the earliest meaning in English. Culinary sense of "to decorate a dish for the table" predominated after c. 1700. Older meaning survives in legal sense of "to warn or serve notice of attachment of funds" (1570s). Related: Garnished; garnishing.
garnishment (n.)youdaoicibaDictYouDict
1550s, "embellishment, adornment, decoration," from garnish (v.) + -ment. Legal financial sense from 17c. The verbal noun garnishing also was used in the sense "ornament, that which decorates" (late 14c.).