Radishes sometimes come with the greens still attached and they're perfectly edible. If you choose to eat them, make sure you give them a good wash to get rid of any debris or dirt. You can either swish them in cold water or put them in a colander and run water over them.  Heat some oil in a pan and fry some minced garlic. Add the radish greens, grind in some salt and black pepper, and cook for a few minutes. The cooking time is similar to that of spinach, so it shouldn't take more than 3 or 4 minutes to cook them. When they're wilted and have softened, they're done. You can use any herbs, spices, and seasonings you want, and you'll find these greens pair with any kind of cuisine. They can be a side dish or a garnish.