Vegetarian recipe ideas
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Cook the potatoes in a pan of boiling salted water for 10-12 minutes until just tender. Drain well.
Meanwhile, cook the leeks in the butter until softened, then sprinkle over the flour and stir in well. Keep cooking and stirring for a few minutes, then gradually add the milk, stirring as you do, until you have a sauce. Stir in the cheese, mustard and parsley. Season, stir in the potatoes and tip into a pie dish.
Roll out the pastry to pound-coin thickness. Brush a little egg around the pie dish rim and top with pastry. Trim and crimp the edges, then brush more egg over the top. Cook for 25-30 minutes until crisp and golden.