Preheat your oven to 160°C (320°F) conventional (see note 2 if using a convection oven with a fan) and line two large baking trays with parchment paper. Set them aside.
In a large bowl, combine shredded coconut, sweetened condensed milk, and vanilla. Mix with a spatula or wooden spoon until the coconut is fully coated, breaking up any clumps as you go. Set aside.
In a medium bowl, add egg whites and salt. Using a hand or stand mixer on medium speed, whip until stiff peaks form. This may take 2–3 minutes depending on the strength and size of your mixer.
Add the whipped egg whites to the coconut mixture and gently fold together with a spatula until combined, being careful not to overmix.
Using a medium spring-loaded cookie scoop (about 1½ tablespoons), firmly press the mixture into the scoop before releasing it onto the prepared trays, leaving about 1½ inches between each macaroon.
Bake one tray at a time on the middle rack for 13–15 minutes, or until the tops are just starting to turn lightly golden and feel set to the touch. Avoid overbaking or they’ll become too hard.
Let the macaroons cool on the tray for 10 minutes, then carefully transfer them to a wire rack to cool completely. Keep the trays handy for later.
Once the macaroons have cooled, dip the bottoms of each one into the melted chocolate (see video for demonstration), letting the excess drip off, and place them back onto the parchment-lined trays.
Leave the macaroons to set until the chocolate hardens, then they’re ready to enjoy!