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Preheat your oven on 200 degrees.
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Butter the base of a 9 inch cake tin or similar and line with baking paper.
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Blend the biscuits to crumbs and place in a mixing bowl.
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Melt the margarine in a saucepan and stir in to the biscuit crumbs until mixed well.
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Transfer the crumbs to the lined cake tin and press down with the back of a spoon. Note if this is too difficult, add a larger sheet of baking paper on top and spread with a rolling pin.
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In another mixing bowl, mix together the eggs and quark, vanilla and sweetener.
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Pour on top of the biscuit crumbs and smooth if needed to make level.
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Place in the oven for 30-40 minutes until set, but if browning on the egdes too soon, cover the top with some tinfoil until the time is up.
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Remove from the oven until cooled and place in the fridge until completely cold and serve.