In a bowl, beat egg whites and a pinch of cream of tartar. Add 70 grams of castor sugar and continue beating till stiff peaks

In another bowl, combine the egg yolks, butter and 70 grams castor sugar. Beat well until light and fluffy

Add the condensed milk and continue beating

Add the flour and mix well. Combine with the egg whites mixture. Mix well

Divide this batter into 2 equal parts. Add the mocha paste in one part and vanilla extract in the other. Mix well

Pour 70 grams of the vanilla batter into a baking dish lined with parchment paper, spread it evenly, tap and bake for 7 mins on grill mode. The top of the cake should turn light brown and the cake layer should feel firm. Remove from the oven, use a toothpick to remove any extra air bubbles and press the cake layer with a cake smoothner or smaller square baking dish to make sure the cake layer doesn't rise anymore. Brush on some butter onto this layer and then pour the batter to form the next layer

Continue baking 2 layers of vanilla batter, then 2 layers of mocha batter till you consume all the batter. At the end of baking the last layer change the oven setting to bake mode (top and bottom mode) and continue baking the cake for 8-10 mins. To get a more detailed view of these steps look above the recipe card in this post under HOW TO BAKE EACH LAYER OF THE CAKE STEP BY STEP

Cut pieces of the cake once completely cooled