Using a Thermomix, mix the icing sugar and almond powder finely and add the food colouring.
Then mix in the egg whites (1).
Bring the water with the sugar gently to the boil.
Meanwhile, whisk the egg whites (2).
When the sugar syrup has reached 119°C, trickle it onto the egg whites.
.Then let it cool to 35°C while whisking.
Mix this into the almond mixture.
Pipe the macarons onto a silpat and then let them dry for at least 30 minutes.
Bake the macarons at 160°C for 16 to 18 minutes.