Heat the oven to 200C/180C fan/gas 6.

Wash and dry the potatoes.

Scrub the potatoes clean and pat them dry.

Cut slits in the potatoes, leaving the bottom intact.

Cut parallel slits into each potato, stopping just before you cut through so that the slices stay connected at the bottom of the potato.

Arrange the potatoes in a baking dish.

Brush the potatoes all over with half the butter

Season with salt and pepper.

Bake 30 minutes, then brush with more butter.

The potato layers should be separating at this point in cooking so brush with the butter and get some buttery tastiness into those potatoes.

Bake another 30 to 40 minutes until the crispy on the edges and easily pierced in the middle with a knife.