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1
Position rack in center of oven; preheat to 350F.
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2
Line bottom of 9-inch round cake pan with 2-inch-high sides with parchment paper.
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3
Butter and flour sides of pan and parchment.
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4
Sift flour, baking soda, and salt into medium bowl.
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5
Whisk 2/3 cup sugar and cocoa in another medium bowl to blend; add 1/3 cup buttermilk and vanilla and whisk until smooth.
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6
Using electric mixer, beat butter in large bowl until fluffy.
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7
Add 2/3 cup sugar; beat until well blended.
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8
Beat in egg and egg yolk.
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9
Add buttermilk-cocoa mixture; beat to blend.
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10
Beat in flour mixture in 3 additions alternately with 1/3 cup buttermilk in 2 additions.
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11
Transfer batter to pan.
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12
Bake cake until tester inserted into center comes out clean, about 40 minutes.
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13
Cool cake in pan on rack 30 minutes.
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14
Cut around pan sides.
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15
Invert cake onto plate.
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16
Peel off parchment paper.
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17
Stir espresso powder and vanilla in small bowl until espresso dissolves.
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18
Stir chocolate in top of double boiler set over simmering water until melted and smooth.
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19
Remove from over water; cool.
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20
Using electric mixer, beat butter in large bowl until fluffy.
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21
Add espresso mixture and corn syrup; blend well, scraping down sides of bowl occasionally.
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22
Beat in melted chocolate, then powdered sugar in 3 additions.
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23
If frosting is very soft, freeze until firm enough to spread, stirring occasionally, about 10 minutes.
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24
Spoon 2/3 cup frosting into pastry bag fitted with medium star tip.
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25
Slice cake in half horizontally.
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26
Place bottom layer on 8-inch cardboard round or 8-inch tart pan bottom.
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27
Spread 1 cup frosting over bottom cake layer.
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28
Top with second cake layer.
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29
Spread remaining frosting over top and sides of cake.
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30
Reserve 24 almond slices.
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31
Press remaining almonds onto sides of cake.
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32
Pipe 12 frosting rosettes around top edge of cake, spacing evenly.
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33
Place 2 almond slices in each rosette.
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34
(Can be made 1 day ahead.
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35
Cover; chill.
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36
Let stand at room temperature 2 hours before serving.)