1Weigh out 100g of egg whites by cracking eggs individually into a bowl first.
2Place almond flour and confectioners' sugar into a food processor and pulse to break up lumps and combine into a fine powder.
3Sift the processed mixture, discarding any large remaining clumps.
4Wipe the mixing bowl with vinegar or lemon juice to ensure it is free of grease.
5Add egg whites to the bowl and begin mixing on high. Once frothy, add the cream of tartar.
6Slowly spoon in the granulated sugar while mixing until a stiff, stable peak forms.
7Add vanilla and food coloring, then continue mixing until the meringue is stiff enough to stay in the bowl when inverted.
8Fold the dry mixture into the meringue in three batches using a scraping and cutting motion, followed by pressing the batter against the sides of the bowl to reach the correct consistency.
9Pipe the batter onto parchment-lined baking sheets using a piping bag with a round tip, ensuring pieces are roughly the size of a quarter.
10Tap the baking sheets firmly on the counter to release air bubbles, then let the macarons sit until they are matte and dry to the touch.
11Bake in an oven preheated to 300°F on the center rack.