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In a food processor mix almond flour and icing sugar. Avoid mixing for too long otherwise, you risk that the almonds' sweat oil. You have to get a very fine and perfectly mixed powder. Sift well at least 2 times, this operation allows you to have smooth and impalpable flour and consequently perfectly smooth shells! Beat the egg whites perfectly until stiff using a glass container, adding the granulated sugar in 3 times, and the meringue powder.