Wash and dry the kale, then remove the stems.
Chop the stems about ¾ of the way, leaving the tough large ends, then cut leaves into bite sized pieces.
Pour the olive oil into a medium saucepan over medium heat, then add the garlic and sauté until softened, about 1-2 minutes.
Add the kale stems and sauté for 1-2 minutes, then add the red pepper flakes and oregano and cook for about 30 seconds more.
Stir in the water and kale leaves, season with salt, then cover and cook for about 5 minutes or until the kale is wilted.
Mix in the beans and sherry vinegar, then cover and cook for 10 minutes, stirring once or twice half way through.
Taste and adjust seasoning as needed, then serve with an extra drizzle of good extra virgin olive oil and plenty of crusty bread on the side.