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1
Using vegetable peeler, remove peel (orange part only) from orange in strips.
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2
Cut strips into matchstick-size pieces and place in small saucepan.
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3
Cover with cold water; bring to boil.
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4
Cook 30 seconds; drain.
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5
Rinse saucepan; add 1/4 cup sugar, 2 tablespoons water, and peel.
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6
Stir over medium-low heat until sugar dissolves.
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7
Simmer until peel is translucent and syrup is thick, about 20 minutes.
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8
Using tines of fork, transfer peel to plate and cool.
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9
(Can be made 1 day ahead.
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10
Cover and store at room temperature.)
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11
Using electric mixer, beat butter, sugar, cinnamon, and salt in large bowl until smooth.
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12
Beat in cocoa powder.
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13
Add flour and beat until dough comes together in moist clumps.
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14
Gather dough into ball; flatten into disk.
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15
Wrap in plastic and chill until firm, at least 1 hour and up to 1 day.
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16
Roll out dough between sheets of waxed paper to 11-inch round.
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17
Peel off top sheet of paper.
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18
Invert dough over 9-inch-diameter tart pan with removable bottom; peel off paper.
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19
Gently press dough into pan.
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20
Press dough overhang in to form double-thick sides.
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21
Pierce dough all over with fork.
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22
Refrigerate 30 minutes.
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23
Preheat oven to 375F.
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24
Bake crust until sides look dry and bottom looks bubbly, about 14 minutes.
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25
Transfer crust to rack.
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26
Using back of spoon, press up sides of dough if falling.
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27
Cool completely.
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28
Toss almonds, sugar, and cinnamon in small bowl.
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29
Chop all but 2 strips of peel.
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30
Sprinkle chopped orange peel, then almond mixture over bottom of prepared crust.
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31
Place cream in heavy medium saucepan.
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32
Bring to simmer.
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33
Remove from heat.
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34
Add chocolate and whisk until chocolate melts and mixture is smooth; mix in Grand Marnier.
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35
Pour into crust.
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36
Refrigerate until filling is firm, at least 3 hours.
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37
Garnish with remaining 2 orange peel strips.
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38
(Can be made 1 day ahead.
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39
Cover loosely with foil and keep refrigerated.)
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40
Using sharp knife, gently loosen crust from pan sides.
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41
Remove pan sides.
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42
Cut tart into wedges; serve cold.