Start by preparing the mousse base. Whisk together in small bowl sugar, egg yolks and vanilla. In large saucepan, whisk together 1 cup of the whipping cream with flour. Cook for 1-2 minutes over low/medium heat, stirring constantly until hot but not boiling. Clumps will form in the cream; whisk until smooth, thick cream forms.

Pour hot cream slowly into egg yolks, whisking constantly. Pour cream back into saucepan, continue cooking over medium/low heat, stirring constantly, until thick custard forms. Do not boil, this will cause your custard to separate. Remove from heat and add white chocolate. Whisk until completely melted. Let custard cool completely; can place bowl over ice bath to accelerate cooling.

Finish preparing mousse when custard is completely cooled: In mixer bowl, whisk remaining 2 cups cream until peaks form. If you want a sweeter filling, add 1 cup of confectioner's sugar into the cream first, then whisk. First, add a small amount of whipped cream into custard, folding gently. Then, begin adding cooled custard into cream in small portions and fold gently, adding more custard until everything is well combined. Fold gently and slowly to ensure that whipped cream stays airy and light. Refrigerate the mousse until slightly set, about 1 hour, then use to assemble crepe cake.

It is important to have all ingredients for the crepes at room temperature before mixing to avoid a clumpy batter. Hand whisk together eggs, milk and water. Add butter, vanilla and sugar. Sift in flour in small batches. Whisk until no clumps remain. Let batter stand for about 10 minutes to allow bubbles to dissipate.

Preheat an 8 or 9-inch non-stick crepe pan or frying pan over medium heat. Add 1/4 cup of batter at a time to the pan, tilting the batter around the pan to form the crepe. After 1 minute, turn the crepe over and cook for additional 30 seconds. Crepes are ready to be flipped once the top losses its gloss and edges turn golden brown. Stack crepes and set aside to cool completely. Split the stack into 3 or 4 piles to cool quicker.

To assemble the crepe cake, make sure mousse sets up a little bit so it’s easier to handle. Spread a generous amount of mousse between each crepe. Spread a layer of mousse over the top and garnish with broken pieces of chocolate bar, fresh berries and mint leaves.

Refrigerate cake overnight to set completely.