9. When they are completely cool, pipe the custard buttercream onto one biscuit, leaving a slight border around the sides, ...

You can't simply pipe custard filling into the deflated choux pastry to compensate for the lack of structure. At the very least, it won't be easy. By definition, the choux pastry should have a ...

Transfer the meringue mixture to a piping bag. Spread 4-5 tablespoons of the fruit jam over the set custard, then pipe the meringue on top. Lower the oven temperature to 150C/130C Fan/Gas 2 and ...

Set aside. (If the ganache is too stiff, allow to come to room temperature and beat with a wooden spoon until a smooth piping consistency.) For the coffee custard filling, heat the milk in a heavy ...