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1
Blend flour, sugar, lemon eel and slat in processor 5 seconds.
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2
Add butter, yolk and vanilla and process until large moist clumps form.
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3
Gather dough into ball; knead briefly to combine well.
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4
Flatten into disk.
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5
Wrap in plastic; chill until firm enough to roll, about 30 minutes.
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6
Preheat oven to 400F.
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7
Roll out dough between sheets of plastic wrap to 11- to 12-inch round.
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8
Peel off top sheet of plastic.
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9
Turn dough over; press into 9-inch-diameter tart pan with removable bottom.
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10
Peel off plastic.
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11
Fold in any excess dough, forming double-thick sides.
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12
Pierce crust all over with fork.
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13
Freeze 15 minutes.
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14
Bake crust 10 minutes.
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15
Using back side of fork, press crust flat if bottom bubbles.
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16
continue to bake until crust id golden, about 10 minutes (crust sides may shrink slightly.)
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17
Transfer to rack and cool.
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18
Bring cream to boil in heavy small saucepan and whisk until smooth.
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19
Spread 1 cup chocolate filling in prepared crust.
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20
Refrigerate until firm, about 45 minutes.
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21
reserve remaining filling in saucepan.
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22
stir sugar and 1/3 cup water in heavy medium saucepan over low heat until sugar dissolves.
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23
Increase heat and boil until syrup is amber color, brushing down sides with wet pastry brush and swirling pan occasionally, about 8 minutes.
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24
Remove from heat.
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25
Add cream, butter, vanilla and salt (mixture will bubble up).
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26
Return pan to very low heat; stir until caramel is smooth and color deepens, about 5 minutes.
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27
Refrigerate uncovered until cold but not firm, about 20 minutes.
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28
Spoon caramel filling over chocolate filling.
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29
Pipe of drizzle reserved chocolate filling decoratively over cararmel (if chocolate is too firm to pour, warm slightly over low heat).
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30
Refrigerate tart until caramel is firm, at least 1 hour.
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31
(Can be made 2 days ahead.
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32
Cover keep chilled.)