Cheeseburger pie, a burger to share!

Preparation

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  Line the pan with 1 pastry sheet and sting it with a fork. Apply tomato sauce on the bottom.
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  Fry the onion in a pan, than add the minced meat and cook it.
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  Put it in a bowl, add salt, pepper, and mustard. Mix well, then add the pickles slices in little pieces.
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  Pour this mix in the pie pan, and smooth the top. Arrange the cheddar slices on it to cover the meat.
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  Fold the pastry back on the cheese, then cover with the second pastry sheet. Fold the edges under the first pastry to form a pie.
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  Brush with egg yolk, then sprinkle with sesame seeds. Bake 30 minutes at 390°F (200°C)
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  There you are, your cheeseburger pie is ready!