Brussels sprout

Brussels sprouts have the highest amount of vitamin C, 94 mg per 100 g, of all brassicas.

An excerpt from the article 23 facts about brussels sprout

It also contains B vitamins (B1, B2, B3, B5, B6), folic acid, vitamins A, E, and H, beta carotene, and is a source of potassium, calcium, magnesium, manganese, zinc, copper, iron, omega-3 fatty acids.