Add the meringue to the almond meal and icing sugar mix and stir well using a spatula. When all the meringue has been incorporated, you need to do what is known as the “macaronnage”. Using a pastry scraper (or the same spatula that you were using to mix), scrape the batter back and forth against the bowl to remove air bubbles, until your batter ribbons off the scraper (or “flows like magma”).