Put the potatoes, water, and salt in a saucepan.Bring to a boil.Bring to a boil, then reduce heat to low and boil for 15 to 20 minutes.Or until a fork pierces it.When finished boiling, drain.
Heat the butter in a saucepan over medium heat.Add the kale. Cook for 3-4 minutes.Add green onions. Cook for 1 minute.Add the milk. Mix well.Add the potatoes. Reduce heat to low.Mix well, mashing the potatoes.
Adjust seasoning with salt and pepper.Serve in bowls.Put the butter in the center.Finish.