Well, it looks like a french word, so the latter.

The former is the English effort to irritate the French.

On the rare occasion when I have to pronounce it – on-deev.

I prefer eating bok choy, but I’ve eaten my share of on-DEEV.

My mother taught me to say “on-dive” when she hand me a leaf with a spoonful of shrimp on it.

In French, the “en” is pronounced “ohn” like “ohn-velope” not “enn-velope.” The “i” is pronounced “ee” so it would be ohn-deev.

Chicory.

Depends on which side of the pond I’m on.

According to the American Heritage Dictionary, it can be pronounced either way; however, your way is the preferred pronunciation.

The French way, because I’m classy and refined. :)

I say Enn-dive, but I had never even heard of it until an Italian friend made an endive pie about 27 years ago when she was staying with me, and now I am wondering if she said the word to me in English when I asked her what it was. I think it is more likely she said it in Italian or Spanish, but I am not sure. I didn’t know it was a French word, so I am open to changing how I pronounce it.

eh (nasal vowel) + deev

Not with a contrived accent, but in keeping with the word’s pronunciation.

en dive

My Midwestern roots have always pronounced it ENdive. It was only when I was working with an multi-cultural team in a major hotel in Dallas that I heard the other pronunciation.—I also heard marjoram referred to as marYOR-ma.