3 cups Heavy whipping cream
1 tsp Orange extract
3/4 cup Powdered sugar
2 1/2 cups Orange curd I used store bought
Using both a chilled bowl and chilled beaters, beat the cream until frothy.
Add the icing sugar and extract gradually while beating.
Whip until light and a thick enough consistency to spread as an icing. Mix in 1/4 cup of orange curd to the whipped cream. If you want to stabilize the cream add 1 tsp of bloomed gelatin to it
2 3/4 cups cake flour
1 1/4 cups plus 2/3 cup sugar
3/4 teaspoon baking powder
1/2 teaspoon salt
3/4 cup vegetable oil
4 large egg yolks
6 tablespoons sour cream
1/2 cup plus 1 tablespoon whole milk
2 teaspoons grated orange peel
1 1/2 teaspoons vanilla extract
6 large egg whites
Preheat oven to 350°F. Butter and flour three 9-inch-diameter cake pans with 1 1/2-inch-high sides. Sift flour, 1 1/4 cups sugar, baking powder, and salt into medium bowl. Whisk oil and egg yolks in large bowl until well blended. Whisk in sour cream, then milk, orange peel, and vanilla. Whisk in dry ingredients in 3 additions. Using electric mixer, beat egg whites in another large bowl until soft peaks form. Gradually add remaining 2/3 cup sugar, beating until whites are stiff but not dry; fold into batter in 4 additions. Divide batter among prepared pans.
Bake cakes until tester inserted into center comes out clean, about 20 minutes. Cool cakes in pans 5 minutes. Cut around pan sides. Turn cakes out onto racks and cool completely. Place 1 cake layer, flat side up, on 8-inch tart pan bottom or platter. Spread 1 cup curd over. Top with second cake layer, flat side down. Spread 1 cup curd over. Top with third cake layer, flat side down. Cover; refrigerate assembled cake.