In a mixing bowl with a paddle attachment, make an almond paste with the ground almonds, icing sugar, 2 g Prova Gourmet Madagascar Bourbon Pure Ground Vanilla Powder (50g) and the first quantity of egg whites.
Begin slightly whisking the second quantity of egg whites, and mix the sugar and water together and bring to 118°C. When at this temperature, pour over the whisked egg whites mixture. This is creating a meringue.
Allow the meringue to turn for a few minutes and then pour (still warm at 40°C) onto the almond paste little by little. Make sure not to make any grains in the mixture.
Work by hand and 'macaroner' the mixture and pipe onto a "silpat" sheet or onto sheets of silicon paper spaced regularly.
Bake the macarons in a fan forced oven at 150°C for 15 min. Allow to cool.
Vanilla Ganache
In a saucepan, heat the cream, 20 g Prova Gourmet Madagascar Bourbon Vanilla Flavor with Seeds (Alcohol Free) and 1 g Prova Gourmet Madagascar Bourbon Pure Ground Vanilla Powder (50g). Pour the boiling mixture over the 400 g Callebaut W2 28% White Chocolate Baking Callets and the 50 g Cacao Barry Mycryo Cocoa Butter.
Mix together then cover with film on contact with the ganache. Cool down the mixture in the refrigerator overnight.
Assembly
Turn over half of the macarons, then using a piping bag fitted with a plain no°12 nozzle, fill generously with the vanilla ganache. Close the filled macarons with a macaron of a similar size.
Allow the macarons to mature overnight in the refrigerator before freezing or tasting.