Egg white mixture: in a large bowl, add the egg whites, sugar, and tartar powder, and beat until you see hard peaks when lifting the mixer up.
[Cake] Step 3
3
Egg yolk mixture: in another large bowl, whisk egg yolk, water, vegetable oil until evenly combined. Then add cake flour and baking powder, salt, and whisk to make sure there are no lumps.
[Cake] Step 4
4
Take about ¼ of the egg whites and fold them into the egg yolk mixture, then repeat with remaining egg whites until batter is evenly combine
[Cake] Step 5
5
Transfer batter to prepared 14 x 10 inches baking sheet pan and smooth the top with an offset spatula.
[Cake] Step 6
6
Bake 350°F(180°C) for 15 mins until light golden brown. Let cool completely.
[Filling] Step 1
7
In a medium bowl, add whipped cream, orange marmalade, and combine well.
[Apple Flower] Step 1
8
Cut ⅓ of the green apple.
[Apple Flower] Step 2
9
Slice it thinly.
[Apple Flower] Step 3
10
Insert a toothpick from the end side.
[Apple Flower] Step 4
11
Spin and spread the apple slices to form a flower shape
[Assemble] Step 1
12
Use a 2.5-inch wide cup, and press down on the cake. Remove the cake piece from the cup. This will make about 16 round cake slices. Divide the cake into two batches, 8 pieces each.
[Assemble] Step 2
13
With one batch, trim the cake to form a dome shape. Layer a flat cake piece, top with cream filling, add the dome shape cake on top, and cover with the cream. Shape it into a dome.
[Assemble] Step 3
14
Cover the cake with green piping gel. Repeat with orange and clear color piping gel.