Preheat the oven to 350ºF (180ºC) . Line two baking sheets with parchment paper or silpat baking sheets.
Add the almond flour and confectioners’ sugar to a food processor fitted with a blade attachment. Pulse until the mixture is a fine powder. Sift into a medium mixing bowl to remove any lumps.
In the bowl of a stand mixer fitted with the whisk attachment, beat the egg whites and cream of tartar at medium speed for 2 minutes. Increase the speed to high and continue to beat until the egg whites become fluffy, about 2 minutes. Slowly add the granulated sugar, continuing to beat on high, until the mixture is glossy and forms stiff peaks, an additional 2 minutes. Add the food coloring and beat on high until the food coloring is just incorporated, about 30 seconds.
Gently add the almond mixture into the meringue (the egg whites will deflate). Use a wooden spoon to fold the dry ingredients into the meringue until the mixture is smooth. Working from the center of the bowl outwards, turning the bowl as you go so you are mixing in large, sweeping movements. The mixture should be the consistency of lava.
Spoon the batter into a piping bag fitted with a ¼-inch round tip. Pipe 1-inch circles onto the baking trays, about 1-inch apart. Tap the baking sheet on the counter to release any air bubbles.
Bake the macarons until they rise and set, about 9 minutes, with the oven door slightly ajar. Remove from the oven and carefully move the parchment paper to racks to cool completely, about 30 minutes.
Carefully peel the macarons from the parchment paper.