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Sift the flour and rub in the margarine to make a breadcrumb consistency.
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Mix in the egg yolk and sugar.
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With a round ended knife, gradually mix in the water until you reach a nice doughy consistency. You might need more or less than the 2 tbsp specified.
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Wrap in cling film and chill in the fridge for 15 mins or so before use.
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Once the pastry has chilled, roll out to about half a centimetre thick on a well floured surface or between two pieces of cling film.
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Grease a large flan dish and press the pastry into it. Line with greaseproof paper and add baking beans, blind bake on gas mark 5/190c for 15-20 minutes until the pastry is browned.
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While the pastry is blind baking, place the cream, vanilla extract and sugar in a pan and bring to the boil. Take the cream off the heat and add in the margarine and chocolate, stir until both have melted into the hot cream.
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Once everything has melted together whisk with an electric whisk until thick and creamy
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Pour the chocolate into the blind baked case and leave on the side to cool for a few hours, once cold enough place in the fridge and chill for at least 6 hours but ideally overnight.