冬 is winter, and 瓜 is melon (or gourd or squash), so 冬瓜 is winter melon.
About This Dish
Winter melon, also known as wax gourd due to its waxy coating (which contributes to a long shelf life), is present in a variety of Chinese foods, from winter melon soup, candies, stir-frieds, and winter melon teas.