Polderaardappelen Gevuld met Garnalen

Choose 4 large, evenly shaped potatoes. Boil them in their jackets until they are just about cooked. It will be helpful to have pricked them on top first, so that the skins do not burst. Then lay them in a hot oven for a few minutes, so that they dry out and finish cooking. Cut the tops off them and scoop out enough from each to make