On 05/02/2013 03:30 PM, Orchid Win7 v1 wrote:

> 3,747.5 kcal for the cake mix
>
> 1 jar of lemon curd is 400g, so half a jar is 200g.
> 200g lemon curd = 604.0 kcal
> 400g icing sugar = 1,600.0 kcal
> 5,951.5 kcal final total

I believe I may have miscomputed here.

The layer of buttercream in the middle is 100g butter and 200g icing 
sugar. It probably takes another 200g icing sugar to do the top. So that 
gives us

    200g lemon curd  =   604.0 kcal
    400g icing sugar = 1,600.0 kcal
    100g butter      =   680.0 kcal
                       6,641.5 kcal for the whole cake
                         553.5 kcal per slice

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