For the macaroon shells
Preheat the oven to 160'C.
Whisk the egg whites to semi whipped, then add 150g caster sugar and the food colouring. Whisk until you have a stiff and glossy meringue mixture.
Use a blender to mix the icing sugar with the almond powder. Sieve this mixture into a bowl to ensure that you have a very fine, lump-free powder.
Incorporate the dry ingredients into the meringue mixture. Use a spatula to cut and fold the mixture until is smooth, shiny and ribbon-like.
Fill a piping bag with the mixture and pipe the macaroons onto a lined baking tray. Leave the macaroons to dry slightly for 15 minutes at room temperature and then bake in the preheated oven for 15-20 minutes.
For the buttercream filling
Mix the butter and the icing sugar in a bowl. Zest the lime and grate the ginger. Add the lime zest and ginger to the buttercream and mix well.
To assemble
Allow the macaroons to cool. Once cool, fill half of the macaroon shells with the lime and ginger cream and then top with a second shell.

Place the macaroons in the fridge to firm up before serving.
Recipe techniques in video
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