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1
To make the pastry, sift the flour and cocoa into a bowl, add the sugar and the butter and rub the butter in with fingertips or an electric mixer until it resembles fine crumbs.
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2
Stir in the egg yolks and gradually bring the crumbs together, squeezing with fingertips and bring together to form a ball.
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3
Add a little cold water if needed.
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4
Knead the pastry lightly and roll out thinly on a lightly floured surface.
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5
Lift the pastry over a rolling pin and then drape into a 24cm (9 1/2in) fluted flan tin that is 2.5cm (1in) deep.
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6
Ease the pastry into the flan tin, pressing into the flutes.
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7
Trim the pastry a little above the top of the tin with scissors to allow for shrinkage during baking.
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8
Prick the base with a fork and chill in the fridge for 30 minutes.
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9
Preheat the oven to 190C/375F/Gas Mark 5.
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10
Transfer the chilled tart tin to a baking sheet, line the pastry case with a large square of non-stick baking paper and fill with baking beans.
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11
Cook for 10 minutes.
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12
Carefully lift the paper and beans out of the pastry case and cook for 5-10 more minutes until the base is crisp.
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13
Meanwhile make the filling - pour the cream and milk into a saucepan, bring just to the boil, take the pan off the heat and add the chocolate.
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14
Leave for five minutes until melted.
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15
Whisk the eggs, sugar and vanilla together in a bowl until smooth and gradually whisk in the warm chocolate milk.
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16
Sprinkle the raspberries over the base of the warm pastry case.
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17
Strain the warm chocolate cream into the tart case and cook in the oven reduced to 160C/325F/Gas Mark 3 for 25-30 minutes or until just set with a slight wobble in the centre.
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18
Leave to cool at room temperature for at 1-1 1/2hours.
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19
The tart can be made in advance and chilled in the fridge but the filling will be much firmer when sliced.
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20
When ready to serve, remove the tin and transfer tart to a serving plate.
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21
Sprinkle a few extra raspberries over the top and decorate with a little sifted cocoa.
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22
Cut into slices to serve.