Preheat your oven to 325°F (165°C). Line a baking sheet with parchment paper.
Sift the almond flour, granulated sugar, cocoa powder, and a pinch of salt together in a mixing bowl.
Pulse the freeze-dried strawberries in a food processor until finely ground. Set aside.
In a clean mixing bowl, combine the egg whites and lemon juice. Whip with an electric mixer until soft peaks form. Gradually add granulated sugar and whip until stiff peaks form.
Fold in the almond extract and pink food coloring (if using) into the whipped egg whites until just combined.
Carefully fold the dry almond flour mixture into the whipped egg whites using a spatula, keeping the volume.
Divide the batter into three bowls. Add ground strawberries to one, cocoa powder to another, and leave the third plain. Gently mix each.
Using a cookie scoop, portion out the dough onto the prepared baking sheet, alternating the three flavors to create a marbled look.
Lightly dust each cookie with confectioners sugar before baking.
Bake for 15-18 minutes, until lightly golden and set around edges but still soft in the center.
Allow cookies to cool on the baking sheet for a few minutes, then transfer to a wire rack to cool completely. Enjoy!