Preheat the oven to Gas Mark 7.Lightly sprinkle Crystallized Sea Salt on a Baking Tray and then wash the outer Skins of the large Baking Potatoes and prick holes in - with a Dinner Fork,roll the wet - clean,Jacket Potatoes onto the Sea Salt and then bake for 2 hours - could be done in 1 hour and 30 minutes,depends on how large the Baking Potatoes are.