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Preheat oven at 180 degrees Celsius Put a flat tray in oven to be warmed.
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Make a shortcrust pastry by putting flour and butter in a food processor and processing until mix resembles bread crumbs.
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Add egg and water.
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Process until pastry comes together to form a ball, add more water if needed.
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Turn pastry onto a lightly floured surface and knead gently until smooth.
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Form into a 15cm flat round and wrap in greaseproof paper.
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Chill in fridge for 15 minutes.
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Place chilled pastry between 2 sheets of greaseproof paper and roll out to a circle 6cm larger than the dish you will be using.
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Remove top paper and sprinkle flour on top then gently roll over a rolling pin.
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Carefully unroll pastry floured side down into dish, remove rest of baking paper, press gently until base and sides are smooth and even.
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Trim excess pastry, put in fridge until firm.
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Take dish from fridge and place on the hot baking tray. Pierce pastry all over with a fork but don't pierce all the way through.
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Put scrunched up greaseproof paper over pastry and half fill with rice, bake blind until firm but not coloured.
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Remove paper and rice and bake until golden and crisp.
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Put chocolate into a microwave safe bowl with the cream and put in the microwave for 20-30 seconds at a time, stirring after each time, until melted.
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Pour into a mixing bowl and add remaining ingredients.
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Stir well and pour into the pastry dish.
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Bake for 15 to 20 minutes or until just set.
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Allow to cool. It will set firmer once cooled and dust top with cocoa.
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Put in fridge until fully set.
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Cut and serve.
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For variations I also add granulated nuts to the the chocolate mix or you could use white chococolate or try creme de menthe instead of Kahlua (or use both!).