Begin by making the lime curd, combine all of the ingredients together in a medium size saucepan and heat gently over a medium-low heat.
Stir continually, until the mixture starts to thicken. Do not let it boil or catch on the bottom of the pan.
Strain into a bowl through a sieve and then place the strained curd into a sterilised jar.
To make the cake, grease and line the base of two deep 6 inch cake tins and pre-heat the oven to 160C.
Place the butter and sugar in the bowl of a stand mixer with the beater attached. Cream them together until they become pale and fluffy.
Slowly add the eggs to the creamed sugar and butter, until it is combined. Then add the lemon and lime zest and juice and mix again.
Then add the flour and baking powder, sifting it into the eggy mixture. Mix until combined, you may need to scrape down the sides of the bowl with a spatula to mix it all in.
When the flour is completely combined, add the milk and give it a final mix, before dividing it between the two prepared tins. Weigh the mix so that it is evenly distributed between the two pans.
Bake the cake for 1 hour until golden or until a cocktail stick comes out clean.
While the cake is baking, make the syrup that will be used to soak the cake, place the sugar, gin and lemon juice in a saucepan and heat until the sugar has dissolved, don't let it boil.
When the cake is cooked, remove it from the oven and leave it in their tins, take the syrup and pour it evenly over both the cakes, using all the syrup. Allow the cakes to cool before removing them from their tins.
Next make the buttercream, sift the icing sugar into the bowl of a stand mixer with the beater fitted, add the butter and mix on low until the two ingredients combine together, allow the butter and icing sugar to come together until it is light and fluffy.
Add the lemon juice and mix it again, taste the buttercream and if necessary add more lemon juice and mix again. Place the buttercream into a disposable piping bag and snip off the end to reveal a hole about 1cm.
Next make the glaze, add all the ingredients, apart from the coloured cocoa butter into a clean bowl and heat over a Bain-Marie or a pan filled with water. Heat until the chocolate has melted and it has combined. Do not let it get too hot.
Heat the coloured cocoa butter to the instructions on the packet and add a few drops to your chocolate glaze, until you achieve the desired colour.
Allow the glaze to cool to below 30C before using.
To make the meringues, whisk the eggs at a low speed in the bowl of a food mixer until they have reached the soft peak stage and are almost whipped.
Add the sugar a spoonful at a time and keep whisking the eggs until they form a stiff peak. Place the meringue in a piping bag fitted with a french tip and pipe 'kisses' onto a baking sheet lined with greaseproof paper.
Bake in an oven pre-heated to 120C for 40-50mins until they have a hard shell, but hardly any colour.
To assemble the cake, get a cake stand or board that you intend to build the cake on, place a blob of lemon buttercream in the middle.
Cut both the cakes in half horizontally and place the first layer of cake on the stand. Pipe a ring of buttercream around the edge.
Take the lime curd and stir in the 35ml of gin until combined. Spoon lime curd onto the cake inside the ring of buttercream until you have an even layer.
Place another layer of cake on top and level it, pipe a ring of buttercream and again fill it with a layer of lime curd. Top with the third layer of cake pipe a ring of buttercream and again fill it with a layer of lime curd.
Take the final layer of cake and ensure the top layer is the bottom of one of the cakes so that you have a really flat surface for the top of your cake.
Pipe a thin layer of buttercream over the cake and using a stepped palette knife, smooth a crumb layer all of the cake, so that you can still see the cake through the icing, but the crumbs will all be secured. Place in the fridge to chill for 30 minutes.
Remove the cake from the fridge and decorate with the remaining buttercream until the cake is smooth and you can no longer see the cake beneath.
Take the drippy glaze and when it is below 30C and not too runny, using a spoon drizzle it over the top of the cake and the edges so it falls down the sides.
Decorate with the meringues and edible flowers if you like.