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.
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.
Step 4
4
Take about ¼ of the egg whites and fold them into the egg yolk mixture, then repeat with the remaining egg whites until the batter is evenly combined.
Step 5
5
Transfer batter to the prepared baking pan and smooth the top with an offset spatula.
Step 6
6
Bake 350°F(175°C) for 15 mins until light golden brown. Let cool completely.
Step 7
7
Make the cream filling: in the bowl of a stand mixer, beat butter and sugar at medium speed until pale and fluffy. Add cream cheese and mix until the mixture is whipped, white and fluffy, about 1-2 minutes until just fully incorporated.
Step 8
8
Spread strawberry filling evenly over the cake surface, leaving a 1/2-inch border on the outer short end. Gently roll up the cake tightly. Freeze for 1 hour.
Step 9
9
Garnish the cake with dollops of whipped cream and strawberries. Enjoy!
