winter vegetables; winter greens
General term for vegetables that are in season during winter, such as leafy greens and root vegetables.
Hot pot dishes made with plenty of winter vegetables warm you up.
tang cai; tong choi; tong choy
Refers specifically to a Chinese leafy green vegetable (often water spinach or similar) known by these names in some regions. This sense may be less common in everyday Japanese.
I ordered stir-fried tong choi at a Chinese restaurant.
Compound of 冬 (fuyu, 'winter') and 菜 (na, 'greens' or 'vegetable'). The specific Chinese vegetable sense likely derives from the same characters used in Chinese cuisine contexts.