We’re on cake duty again for one of our nephews. This year a Lego cake has been requested, which is great because a) it’s nice simple rectangles stacked on each other, and b) I got to create a spreadsheet to work out the various ratios of Lego bricks!

We lined a large cake board with green fondant icing and put discs of the same icing on to make it look like a green Lego board.

The cakes are vanilla and chocolate madeira cakes, taken from the brilliant Cakes, Bakes & Cookies list of mixtures for different cakes sizes. Soph baked square cakes, which get the domed tops cut off, then cut in half to form long Lego bricks, and one of them gets halved again to form small Lego bricks (and one of the long bricks is left over for us!).

The Lego shaped cakes get sliced in half and filled with jam and buttercream icing, then crumb coated with buttercream icing, then coloured fondant icing goes on. Soph cut the fondant into panels to cover the sides and top, sticking them into place one by one then joining and smoothing them together. It meant it took a bit longer to cover all four cakes, but was a good way to ensure we got the sharp edges you want for a lego brick.

While Soph is doing that I’m using the cut-off domed tops to make the studs for the top of the bricks with a cookie cutter. These also get covered with fondant icing, however we found putting buttercream on the icing worked better than crumb coating the small and fragile cake discs.

Then everything gets stacked up and glued with jam.

And voila: Lego cake!