feuille should be tall but not oversized; I recommend a maximum height of 2 inches STORAGE Keep the mille-feuille refrigerated for 3 to 4 hours; after that the cream will start to make it soggy VARIATION MILLE-FEUILLE WITH BERRIES: You can add strawberries or raspberries to your mille-feuille Place the berries between the rounds of mousseline, or on top of the mille-feuille, or both I like to spread a thin layer of raspberry jam on the pastry before topping when I use fruit JACQUY’S TAKEAWAYS >> Mille-feuille is best served when it is freshly made The caramelized sugar on the surface creates a natural moisture barrier for 3 to 4 hours, but after that the cream will begin to penetrate the puff and make it soggy A trick would be to cut the baked puff pastry into small individual pieces and fill them just before serving them to your guests This will ensure a flaky puff >> $50 TRICK: Combine the milk with the vanilla seeds and bean the day before and refrigerate overnight for a more intense vanilla flavor >> For cutting the assembled millefeuille, nothing beats an electric serrated knife ... or raspberries to your mille-feuille Place the berries between the rounds of mousseline, or on top of the mille-feuille, or both I like to spread a thin layer of raspberry jam on the pastry before topping when I use fruit... cut the baked puff pastry into small individual pieces and fill them just before serving them to your guests This will ensure a flaky puff >> $50 TRICK: Combine the milk with the vanilla seeds and bean the day... The caramelized sugar on the surface creates a natural moisture barrier for 3 to 4 hours, but after that the cream will begin to penetrate the puff and make it soggy A trick would be to cut the baked puff