Swiss chard leaves are tender and have a taste similar to beet greens and spinach. While some may find the leaves slightly bitter, they are less vegetal in flavor than kale. The crunchy stems are slightly sweet and have a similar taste and texture with bok choy stems. This vegetable sure is beautiful! Chard and other leafy greens are nutritional powerhouses: They are very low in calories, carbs, sugars, and fat, but high in fiber, vitamins, minerals, and antioxidants.