"Vanilla is earthy. It’s ethereal. It’s exotic. It’s indispensable in some recipes and, when added to others on a whim, seems essential. … The ne plus ultra [ˌneɪ ˌplʌs ˈʌltrə] of flavoring." — Dorie Greenspan, Food52.com, 25 Feb. 2022

ne plus ultra [ˌneɪ ˌplʌs ˈʌltrə]
noun

Ne plus ultra refers to the highest point of development or success that something may achieve; it is a synonym of acme.

It is the height, the zenith, the ultimate, the crown, the pinnacle. It is the peak, the summit, the crest, the high-water mark. All these expressions, of course, mean "the highest point attainable."

The New Latin version ne plus ultra, meaning "(go) no more beyond," found its way into English in the early 1600s.

English