{ "@type": "ItemList", "itemListElement": [ "Preheat oven to 220degreesC.", "Boil potatoes. Cut leeks into 1 cm slices. Melt 1/2 of the butter in a pan and cook leeks for about 10 minutes.", "Drain and mash potatoes with the other 1/2 of butter, the egg and 3/4 of the cheese.", "Season to taste, stir in the leeks and turn into a large ovenproof dish.", "Top with remaining cheese and bake for about 10 minutes, until golden. Will take longer if you have prepared the dish in advance." ] }