Several varieties of kale are available in the United States. Curly kale is the most common, with its ruffled leaves. If its earthy flavor is a little too intense for you, try lacinato kale, sometimes called dinosaur kale. It is less bitter than curly kale. Its long flat leaves keep their texture after cooking, so they're the perfect choice for kale chips. Red Russian kale is another common variety found in the United States. Its leaves are sweet and delicate, with a lemon-pepper taste similar to sorrel. However, some people don't like its fibrous stalks.