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1
Make the custard In a saucepan, combine the milk, sugar and vanilla bean and seeds and bring to a simmer.
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2
Cook over moderate heat, stirring, until the sugar dissolves.
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3
In a blender, combine the flour and half of the hot milk mixture (but not the vanilla bean) and puree until smooth.
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4
Add the flour-milk mixture to the milk in the saucepan and cook over moderately low heat, whisking frequently, until thickened, about 8 minutes.
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5
Strain the custard into a medium bowl; discard the vanilla bean.
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6
Let cool until warm, then whisk in the butter a few pieces at a time.
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7
Press a piece of plastic wrap on the surface of the custard and chill for about 1 hour or until firm.
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8
Make the chocolate topping In a heatproof medium bowl set over a saucepan of simmering water, melt the chocolate, about 2 minutes.
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9
Remove the bowl from the pan and whisk in the oil.
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10
Let cool completely.
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11
Using an offset spatula or the back of a spoon, spread the custard in an even layer all over the top of the cake.
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12
Carefully pour the chocolate on top of the custard and spread in an even layer.
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13
Chill until the chocolate sets, about 1 hour.
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14
Serve cold.
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15
Make the chocolate topping In a heatproof medium bowl set over a saucepan of simmering water, melt the chocolate, about 2 minutes.
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16
Remove the bowl from the pan and whisk in the oil.
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17
Let cool completely.
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18
Using an offset spatula or the back of a spoon, spread the custard in an even layer all over the top of the cake.
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19
Carefully pour the chocolate on top of the custard and spread in an even layer.
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20
Chill until the chocolate sets, about 1 hour.
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21
Serve cold.
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22
Make the chocolate topping In a heatproof medium bowl set over a saucepan of simmering water, melt the chocolate, about 2 minutes.
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23
Remove the bowl from the pan and whisk in the oil.
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24
Let cool completely.
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25
Using an offset spatula or the back of a spoon, spread the custard in an even layer all over the top of the cake.
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26
Carefully pour the chocolate on top of the custard and spread in an even layer.
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27
Chill until the chocolate sets, about 1 hour.
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28
Serve cold.
