Split your white fondant into 4 equal portions and ready your gel colourings. I love these ones by Wilton
Knead the red gel into a quarter and repeat with the other colours for 2 more quarters. Mix some yellow and blue to make green for the last quarter of fondant
Tear off 4 balls of yellow fondant a bit bigger than your lego figure shape and knead until nice and pliable. Do the same with 4 balls of any of the other colours
Really pack the fondant into the moulds so you get into all of the little spaces
Use a sharp knife to slice the excess fondant away and pat the back of the figures down nice and flat
Put the mould into the freezer for 20 minutes
Meanwhile, do the same with the lego brick moulds. Use enough fondant to firmly fill each mould, slice off the excess, pat down neatly then freeze for 20 minutes
Take the figures out of the freezer and make sure they've set hard. Gently pull the silicon moulds away and pop them out
When you take the moulds out of the freezer the fondant will immediately start to sweat so you need to work quickly
On top of a sheet of greaseproof / parchment paper, cut the heads and arms off of all the yellow figures and set aside. You can get rid of the rest of the yellow bodies. Roll them up and add them back into the yellow fondant ball
Now cut the heads and arms off the rest of the figures and disgard those. We don't need them and you can add them back into their coloured balls too
Separate the legs from the bodies and now the fun begins!
Use a bit of water and a small paintbrush to 'glue' the yellow arms and heads onto different coloured torsos
Do the same to add the trousers in a different colour
Set your Frankenstein creations aside on the greaseproof paper to set and harden. They'll probably be sweating by now but don't worry, they will dry and firm up. Just leave them uncovered
Do the same thing with your lego bricks. Pop them out and then cut some in half lengthways, some widthways and cut some into quarters or a third and a quarter
Repeat until all your fondant is used up. This will make a good amount of bricks, between 60 and 80, maybe even more depending on the sizes of your moulds. I made 48 actual lego sized bricks 3cm x 1.5cm then 38 larger ones 4.5cm x 2.5cm plus 4 small figures and one large
Let your fondant sit, uncovered in a cool, dark, dry place for at least 4 days until solid. A tip for setting it more quickly is to mix 3 tsp of powdered CMC or Tylose (look in the baking aisle) with every 450g / 1 pound of fondant you use. Or use a mixture of 50/50 fondant / gumpaste
Once your lego figures have set, you can add the face details on with the black edible ink pen
My recipe for buttercream is 175g icing sugar, 75g Stork margarine (gold foil block is dairy and soy-free) and 1tsp vanilla extract. This is enough for 12 cupcakes or a 9" single layer so I scaled it up by 4x to ensure I had enough
I wanted to stick with the primary colour theme so when I came to layer up my cake I divided 1kg of buttercream icing into 5 bowls and coloured one bowl red, one yellow, one green and one blue leaving the last white. I piped each colour individually onto my bottom layer then placed the middle on top. I repeated piping the buttercream onto the middle layer ready for the top layer ready to go on
After I put the top layer on I used the leftover coloured buttercream to cover the edges all around the bottom and middke layers and the white to do the top layer. Then I started to lay my bricks
I kept building up the sides with my larger bricks until I was happy
Then I used the smaller bricks to start to build my walls for the top of the cake. I also added the twins names in fondant lettering
To finish I used more buttercream as mortar to keep the walls from falling down lol, and added the figures and candles
Just add your bricks as and where you like. You could cover a whole cake if you like for a really great effect or you could use a sheet of fondant over a thin layer of buttercream for a neater and smoother finish on the cake itself. You could also do cupcakes and top each with a buttercream swirl and a few bricks
My finished cake, right side
Left side
Back
And sliced with the rainbow buttercream layers
