Place egg whites in a medium bowl, and let stand uncovered at room temperature for exactly 3 hours.
Line 2 rimmed baking sheets with parchment paper.
Using a pencil, draw 1¾-inch circles 2 inches apart on parchment paper. Turn paper over.
In the work bowl of a food processor, combine confectioners’ sugar, almond meal, cocoa, and salt, pulsing until blended.
In a large bowl, beat egg whites at medium-high speed with a mixer until frothy. Gradually add granulated sugar, beating at high speed until stiff peaks form, 3 to 5 minutes. Egg whites will be thick, shiny, and creamy.
Add almond mixture to egg whites, folding until well combined and mixture falls from spatula in thick sheets. Let batter stand for 15 minutes.
Transfer batter to a pastry bag fitted with a medium round tip (Wilton #12). Pipe batter into drawn circles on prepared baking sheets. Slam baking sheets vigorously on countertop 5 to 7 times to release air bubbles. Let stand at room temperature for 45 to 60 minutes before baking to help develop the macarons’ signature crisp exterior when baked. (Macarons should feel dry to the touch and should not stick to finger.)
Preheat oven to 325°.
Bake until firm to the touch, approximately 15 minutes. Let cool completely on pans. Transfer to an airtight container with layers separated by waxed paper. Refrigerate until ready to fill and serve.
Place Semisweet Chocolate Ganache in a pastry bag fitted with a medium round tip (Wilton #12). Pipe ganache onto flat side of a macaron, and top with another macaron, flat sides together. Push down lightly, and twist so filling spreads to edges. Repeat with remaining macarons and filling.
Serve immediately, or place in an airtight container, and refrigerate for up to 3 days.
Recipe by TeaTime Magazine at https://teatimemagazine.com/chocolate-macarons-recipe/