Need to make a sponge (two layers with something in between) and cover it in fondant icing. Have ready made things to stick on top of that. We usually use the all-in-one sponge recipe with equal quantities of fat:sugar:flour. That is too sweet if you stick jam in the middle. I looked at Madeira cake recipes and can see they'd have more flour. Would that be the right recipe to use?
Also, sticking the jam in the middle.... Do I buttercream both layers then jam between that, to stop the jam seeping all the way through the cake? And I put buttercream on the top under the icing, don't I?
I'm used to making chocolate sponge, sticking choc spread in the middle and choc icing on the top - job done. Plain sponge is much harder than I thought it would be!