Delicious soft and fluffy coffee cake/Mocha cake slice recipe 

Ingredients:
6 egg yolks
1/2 cup sugar
1/2 cup oil
2 tsp coffee + tbsp hot water
1 tsp vanilla extract
1 cup cake flour
1 tsp baking powder
1/4 tsp salt
1 tbsp cocoa powder
Meringue;
6 egg whites
1/2 tsp cream of tartar
1/2 cup sugar
Frosting;
2 cups cold heavy cream
2 tsp instant coffee
1/2 cup icing sugar