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Cream together caster sugar and margarine in a large bowl.
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Beat eggs in a jug or bowl, add one third to the creamed sugar and margarine and beat with a wooden spoon.
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In another bowl sift together the flour and cocoa powder, add one third of this into the creamed mix and beat again. Repeat adding the eggs and flour mix alternately until all off the ingredients are well combined.
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Grease and line 2 or 3 (if you don't have 3 make sure to reserve 1/3 of the mix and bake once the other 2 are done) 8 inches round cake tins and equally spilt the mix between the tins. Place in an oven on gas mark 5/190c and bake for 25-30 mins until cooked.
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Once cooked leave in tins to firm up for 10 mins and then tip out onto a cooling rack, allow to go completely cold. Regrease and line one tin and cook the 3rd cake if you haven't get cooked this one - pour in the batter and again bake for 25-30 mins.
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Once all cakes are cold, proceed to make the buttercream. Place room temp margarine and icing sugar in a bowl and gently cream together, once combined add in the peppermint extract. Split the buttercream into two bowls, roughly in half, use one bowl between the layers of cake. Spread evenly on the top of one cake, place another on top, more buttercream and then top with the final cake layer.
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Using the remaining buttercream, add in peppermint extract and cocoa powder, mix well.
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Place the cake onto a cake board. Spread a thin layer of the mint choc buttercream around the edge of the cake. Press matchmakers vertically into the buttercream so they stick to the cake, do this all the way round the cake. Once all the edge is covered put in the fridge for 30 mins to set it a little before doing the top.
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Remove the cake from the fridge, use more chocolate buttercream to coat the top of the cake, you want about 3-4mm in thickness, make sure you go all the way up behind the matchmakers.
10.. Fill the top with aeros, sticking them well into the buttercream.
IF YOU WISH TO MAKE THE CAKE INTO AN ANTI GRAVITY CAKE....
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Push a straw into a gap between the aeros. Coat the straw up to the bend in melted chocolate and then build up the aero balls (you'll need at least another 2 bags, depending how big you want your waterfall) around the straw to make an almost pyramid shape but more rough so it looks like they are falling randomly, use dabs of chocolate to get the bubbles to stick to each other. I suggest putting the cake in the fridge every so often for 20 mins to set the chocolate a little, this makes it a lot easier to build up as the higher you go the more it starts to fall apart when the chocolate is melted. Add other random balls away from the pyramid so it looks like they have rolled away.
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Once you have built up all the bubbles to the bend in the straw, take one of the empty aero bags and using a little sellotape stick the skewer and bend part of the straw to the inside of the bag, make sure it is tilted to look like the bubbles are falling from it and also hiding the straw.
