How to Make It
In a large skillet, heat 2 tablespoons of the butter. Add the ham steaks and cook over moderate heat, turning once, until golden brown, 5 minutes. Transfer the ham to plates. Add the leek and 1 1/2 cups of water to the skillet and cook, stirring, until the leek is softened, about 3 minutes. Stir in the peas, tarragon and the remaining 2 tablespoons of butter and season with salt and pepper. Spoon the leek-pea sauce over the ham and serve.