In order for me: mushrooms, peas and cauliflower tied, green beans. I will eat any of these four happily. I really detest sweet corn. It’s just edible as a minor player in a casserole or similar meaty dish. The only way I like corn is as baby corn, usually raw with a dip, though cooked in Chinese mixed vegetables it’s also quite nice.
If they gave sufficient nutrition, I could live off mushrooms!