Wash and dry the potatoes. Bake for 1-1.5 hours, until soft. Remove the potatoes from the oven and cut in half widthwise. (Do not switch off the oven)
3
Using a teaspoon, schoop out the flesh into a bowl without piercing the skins. Lightly season each skin with salt and divide half the butter among them.
Fill the skins with the mixture and place in a single, fairly tight-fitting layer in an ovenproof baking dish. Dot the remaining butter over them and bake for 10 minutes more. Serve immediately.