. . . . . . . . vegetable(s) have recalcitrant seed.

Chow chow and Pointed gourd are both vegetables that are the recalcitrant seed.
Recalcitrant seeds are seeds that do not survive drying and freezing during ex-situ conservation. By and large, these seeds cannot resist the effects of drying or temperatures less than 10°C (50°F); thus, they cannot be stored for long periods like orthodox seeds because they can lose their viability.
Some other examples are avocado, mango, mangosteen, lychee, cocoa, rubber tree, etc.