Method

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1．Pre heat oven to 200℃. Let frozen pie crust stand at room temperature for

　  15minutes.
2．Slice the onion.
3．Heat the butter in a pan and cook the onions until golden, then remove from the heat

 　  and stand it to cool.
4．Beat the eggs in a bowl, then gradually add the cream, whisk until the mixture is

　   smooth, then season with salt and pepper.
5．Stir in the onions and half the cheese. 
6．Place the pie sheet in a grased tart case and press into bottom and sides.
7．Pour the mixture carefully in to the crust. Sprinkle with the rest of the cheese.
8．Bake the quiche for 20 to 25 minutes until set and golden. 
9．Leave to cool in the case.
10．Remove from tart case and serve in slices.