A breadnut is a green fruit, in a round shape with some spikes that are dull on its skin. When ripe this can be used to make cabbage.
Breadnut is a round green fruit that has short, dull regular spikes covering the skin. Inside, the white nuts covered by brown shells (when ripe) are surrounded by white pulp which is eaten when shredded like cabbage and braised. The flesh and seeds are often made into a curry and cooked with coconut milk. When breadnut is green, it is treated more like a vegetable. When it is ripe, the pulp is not used, only the seeds - which are boiled for a long period of time in salted water. Vegetarians love breadnut seeds/nuts because they are nutritious and are an excellent source of protein, carbohydrates and fiber.