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1
Combine 2 1/3 cups sugar and 2 teaspoons cornstarch in heavy medium saucepan.
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2
Gradually whisk in fresh lemon juice.
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3
Whisk in eggs and yolks; add butter.
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4
Whisk over medium heat until curd thickens and boils, about 12 minutes.
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5
Pour into medium bowl.
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6
Refrigerate until cold, at least 5 hours.
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7
(Can be prepared 1 week ahead.
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8
Cover and keep refrigerated.)
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9
Beat powdered sugar and 1 1/4 cups lemon curd in large bowl just until blended.
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10
Beat cream in medium bowl until firm peaks form.
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11
Fold cream into curd mixture in 3 additions.
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12
Chill until firm, at least 4 hours.
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13
Preheat oven to 350F.
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14
Butter and flour three 9-inch-diameter cake pans with 1 1/2-inch-high sides; line bottoms with parchment paper.
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15
Whisk 1 1/2 cups cake flour, 1/2 cup sugar, 2 1/2 teaspoons baking powder and teaspoon salt in large bowl.
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16
Add 4 yolks, 1/4 cup vegetable oil, orange juice, lemon peel and 3/4 cup curd to bowl (do not stir).
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17
Combine whites and 1/4 teaspoon cream of tartar in another large bowl.
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18
Using electric mixer, beat whites until soft peaks form.
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19
Gradually add remaining 1 cup sugar, beating until stiff but not dry.
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20
Using same beaters, beat yolk mixture until smooth.
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21
Fold whites into yolk mixture in 3 additions.
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22
Divide batter equally among prepared pans.
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23
Bake cakes until tester inserted into center comes out clean, about 25 minutes.
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24
Cool cakes in pans on racks 15 minutes.
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25
Turn cakes out onto racks; peel off parchment.
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26
Cool cakes completely.
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27
Spoon 1 cup frosting into pastry bag fitted with plain round tip; refrigerate bag.
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28
Place 1 cake layer on cake platter.
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29
Spread top of cake layer with 1/3 cup curd, then 1 cup frosting.
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30
Top with second cake layer; spread with 1/3 cup curd and 1 cup frosting.
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31
Top with third cake layer.
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32
Spread remaining frosting over top and sides of cake.
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33
Spread remaining curd over top of cake, leaving 3/4-inch plain border around edge.
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34
Pipe chilled 1 cup frosting in bag in small mounds around edge of cake.
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35
(Cake can be prepared 1 day ahead; refrigerate.)
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36
Place lemon slices between mounds of frosting.
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37
Slice cake and serve.