How to make Mocha Mousse Cake

Ingredients
For 6 servings:

For cake:
5 eggs
130g sugar
150g flour
30g cocoa

For cream:
5 egg yolks
230g sugar
100ml water
300g butter
10g soluble coffee
1 espresso

For syrup:
150g sugar
150ml water
1 espresso

For Italian meringue:
40ml water
135g sugar
2 egg whites