Start by placing a heatproof bowl over a small pot of simmering water.
Add the egg whites and granulated sugar to the bowl.
Whisk until the sugar has completely dissolved. This will take about 2 minutes.
To the bowl of a stand mixer fitted with the whisk attachment, transfer the egg whites.
Whisk at medium speed until stiff peaks form. This will take about 3-4 minutes. Don’t rush with this step - you really need stiff peaks.
Then place a fine-mesh sieve over the mixing bowl with the egg whites.
Add the powdered sugar and almond flour. Give it a few stirs so it's combined a little better.
Sift half of the powdered sugar + almond flour into the egg whites.
Carefully fold the sifted powdered sugar + almond flour into the egg whites by making a J shape with your spatula.
Carefully fold, about 25x, in the dry ingredients until no large lumps remain.
Then, sift in the second half of the powdered sugar + almond flour and the food coloring.
Continue folding until the meringue reaches the lava stage, after about 1-2 minutes. The lava stage means the meringue is thick and flowing slowly and resembles lava. You’ll know the meringue is ready to be piped once you can draw a figure 8 without the stream breaking.
Transfer the meringue to a piping bag that has been fitted with a small round tip.
Pipe 1” circles, making sure to pipe them at least 1.5” apart on a parchment- or silpat-lined baking sheet.
After you’ve piped a full tray, hold the tray 6” off the counter and drop it straight down to release any air bubbles. Do this about 4-5 times, or until it looks like any large air bubbles have popped.
Let the macarons dry at room temperature for 30 minutes, or until they have developed a skin. While the macarons are resting, preheat your oven to 325 °F (163 °C).
Bake the dried macarons in the preheated oven for 12-14 minutes, or until the macarons are just starting to turn golden brown around the edges.
Remove the tray from the oven and allow the macarons to cool fully on the tray.
Once the macarons have completely cooled, place them in similar-sized pairs and prepare the filling.