Unripe jackfruit has been cooked as a savory vegetable in India for a very long time, and its texture is the reason. The fibers separate under heat in a way few plants do.
The structure is bundled fiber, not soft flesh
Each segment of an unripe fruit is built from long fibrous strands held together by pectin-rich tissue. Cooking softens the binder and the strands stay intact.
Pulled apart, the result is stranded rather than mashed, which is unusual. Most cooked vegetables collapse into particles rather than separating into threads.
That threading is what people recognize as meat-like. It has nothing to do with protein content, which in jackfruit is low.
Ripeness decides everything
As the fruit ripens, starch converts to sugar and the flesh softens and becomes intensely aromatic. At that point it is a dessert fruit and cannot be used savory.
Savory cooking uses fruit picked well before that conversion, when the flesh is firm, pale and starchy. The two products share a name and almost nothing else.
Cans labeled young or green jackfruit in brine are picked at the right stage, while canned jackfruit in syrup is the ripe fruit and will not work.
It absorbs seasoning rather than contributing it
Unripe jackfruit tastes mild and slightly starchy, so whatever spice paste it is cooked in dominates the finished dish.
The fibers give it a large surface area, which helps it take on the flavor of a gravy more thoroughly than a dense vegetable would.
Traditional preparations lean into this by cooking it long in strongly spiced bases, treating it as a carrier rather than as a flavor in its own right.
Preparation is the reason it stayed a specialty
A whole unripe fruit is large, and its cut surfaces release a sticky latex that adheres to knives and hands. Cooks oil their hands and blades before starting.
That handling cost is why the canned and frozen forms are what most cooks abroad use, and why the ingredient spread only once processed forms became widely available.
A whole fruit also yields several distinct parts, since the seeds are cooked separately as a starchy vegetable and the fibrous connective tissue is used in some regional dishes.
Buying it in the United States
Indian and Southeast Asian groceries stock cans in brine and frozen cut pieces, and larger US supermarkets increasingly carry a can in the international aisle.
Brined fruit needs rinsing and often a preliminary boil, since the packing liquid is salty and carries a faint metallic note that survives into a finished curry.
Frozen pieces hold texture better than canned, because they have not been through the heat of retort processing that softens the fibers before cooking even begins.