There are two broad types of Endive, curly and broad-leafed.
Both curly and broad-leafed versions belong to the same family as Aster flowers. The seeds for both types of Endive are very small; it takes about 350,000 to 450,000 to make up a pound (450g.)
The leaves of both varieties have a mild, pleasing bitterness, unless left in the ground too long: if they become overmature, they get tough and unpleasantly bitter.
Endive doesn't "bolt" as easily in summer heat as does its sweeter salad friend, lettuce.
Belgian Endive is not actually endive at all; it is chicory.
Good both used fresh in salads, and braised.
Was used by the Egyptians, Romans and Greeks, both raw and cooked. (The Romans acquired it in the first century AD). Some say native to India; others say native to Mediterranean.
Endive was being grown in Northern Europe by the 1200s. It was brought to America by colonists.
Sometimes in North America, the curly-leaved variety is called "Chicory", in order to help consumers not confuse curly-leaved endive with broad-leaf endive. Given that there's already a salad green called "chicory", it may elude you immediately as to how this is going to rocket the cause ahead.
Literature & Lore
EndiveEndive; Escarole; Green Curled Endive; Radicchio
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Endive Frisée; Cichorium endivia var. crispa (Scientific Name); Indivia (Italian); Endibia (Spanish)