urgent help needed

[pumpkin pie]

I am trying to make a buttercream for a cake my mum used to make called frankfurter kranz, (german) and the buttercream was made by beating together unsalted butter (beated to light and fluffy) and cold custard (both need to be at room temp. But my butter has separated from the custard and I have a curdled mess in the mixer bowl. Can anyone help with this as I need to decorate the cake tomorrow pref with this curdled mess if I can. HELP

[pumpkin pie]

It's ok think I have fixed it, I remeber reading that both had to be at the exact same temp, so put both in the same bowl, blitz a few secs in the micro and then re whipped in the kenwood seems to have worked. Whewww.

[Amy :-)]

Good job pumkpin pie

Would you be so kind as to post a photo of the finished cake? I'd love to see how it turned out