You can serve mustard greens with any number of things. They go well with ham, bacon, or smoked meats. You can also add them to soups or stews. If you feel adventurous, chop up the greens and add them to a salad, or blend them into a smoothie. You could roast mustard greens and season with salt or spices like pepper flakes, black pepper (for a peppery taste), and cloves of garlic. This makes a delicious side dish.