Rainbow chard is a nutritious leafy green that comes as a mix of bright colored stems including yellow, white and deep red. In the kitchen, Rainbow Chard is used as a salad green and a leaf vegetable, making it a versatile ingredient. It can be used both raw and cooked, while cooking will give the leaves a milder flavour and a more tender texture. Chard, in general, is used as a substitute for spinach and commonly mixed with other leafy green vegetables.