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Method Prep:20min › Cook:45min › Ready in:1hr5min
Partially cook the chopped onion in the microwave for 3 to 4 minutes. Leave to cool.
Grate the cheese and mix into the cooled onion.
Beat the egg in a mug with a fork, and add all but about 5ml to the onion and cheese mix. Season with ground black pepper and freshly grated nutmeg. No need for salt. Mix well and set aside.
Roll out 2/3 of the flaky pastry and line a 25cm pie dish or ovenproof plate.
Pile on the onion and cheese filling. Make a lid for the pie with the remaining portion of pastry.
Add about 15ml of milk to the reserved beaten egg in the mug and use it to brush the pie top.
Bake in a preheated 200 C / Gas 6 oven (or 190 C fan) for about 45 minutes, or until pastry is golden brown.
Serve warm, with baked potatoes cooked at the same time as the pie and either baked beans or green salad.
For a quick pudding baked in the same oven see my 'Dead Fly Pie' recipe. You can use the flaky pastry trimmings from this pie for the dessert pie.