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1
TO MAKE THE COFFEE CREAM: Its best to do this at least 6 hours ahead or, preferably, the day before you make the tart.
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2
Sprinkle the gelatin over the cold water and let it sit for 5 minutes, or until it is soft and spongy, then dissolve it by heating it for 15 seconds in a microwave oven (or do this stovetop); set aside.
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3
Line a fine-mesh sieve with a quadruple thickness of damp cheesecloth.
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4
Bring the cream to the boil, add the coffee, and stir well, then pour the cream through the sieve; discard the coffee grounds.
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5
Wait for 1 minute, then stir the cream if theres any sediment, strain it again.
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6
Stir the sugar and dissolved gelatin into the cream and, once they are incorporated, put the cream into the refrigerator to chill for at least 6 hours, preferably
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7
TO MAKE THE GANACHE: Line a fine-mesh sieve with a quadruple thickness of damp cheesecloth.
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8
Warm the chocolate in a microwave oven (or over a pan of simmering water) just enough to melt it slightly.
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9
Pull the chocolate from the heat.
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10
Meanwhile, bring the cream to a full boil and stir in the coffee.
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11
Pour the cream through the sieve over the white chocolate in two or three additions, stirring gently after each addition with a rubber spatula and only adding more cream when the previous amount is incorporated; discard the coffee grounds.
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12
Dont worry if the ganache separates halfway throughit will come together once all the cream is stirred in.
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13
Once the ganache is smooth, it should be used immediately.
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14
To finish: Pour the ganache into the tart shell.
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15
Cover the top of the ganache with the ladyfingers, placing the flat of each biscuit against the ganache and arranging the biscuits so that they cover the surface as completely as possible, a job that will require cutting a couple of biscuits to fit into small spaces.
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16
Using a pastry brush or a spoon, generously soak the biscuits with the cooled espresso.
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17
Working by hand with a whisk, or using a mixer with a whisk attachment, beat the coffee cream until it holds firm peaks.
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18
Spoon the cream into a pastry bag fitted with a large star tip and pipe rosettes over the top of the tart, or spoon the cream over the tart and smooth it with a spatula.
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19
Refrigerate the tart, away from foods with strong odors, for at least 1 hour to set the ganache.
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20
(The tart can be kept in the refrigerator for up to 8 hours before serving.
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21
If the tart has been chilled for a long time, allow it to sit at room temperature for about 30 minutes before serving.)
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22
If youd like to top the tart with milk chocolate, hold the chocolate over a sheet of parchment or wax paper and, using a vegetable peeler, scrape chocolate shavings onto the paper.
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23
Refrigerate the shavings until ready to serve, and scatter them over the tart at the last minute.
