What the heck is a seakale beet?

Although Swiss chard was known by the ancient Greeks, it is not always recognized in historical literature because of the enormous variety of names, in various languages by which it is and has been called and because of its relation to the beet family. In English it is also known under these names: chard, white beet, strawberry spinach, seakale beet, leaf beet, Sicilian beet, spinach beet, Chilian beet, Roman kale, and silverbeet. Whatever you call it, how do you like to EAT it?