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Lucy Madden
Easy
By Lucy Madden
Published 2015
With its golden crust and its centre still liquid, this makes a perfect first course. The sour cream gives it a slightly tart flavour.
First, preheat the oven to gas mark 6/400°F/200°C. When the potatoes have cooled, grate them. Grate the cheese and chop very thinly about 2 inches of the green part of the leek.
Melt t