Portion the egg white & sugar into the bowl fitted for your stand mixer. Give the mixture a quick stir with the whip attachment. Whip egg white mixture at a medium speed in your stand mixer. Pasteurized eggs take longer to whip than fresh eggs, this will take 5 minutes or so.
While the mixer is whipping away, blend the almond meal, powdered sugar, and sifted cocoa in a clean DRY food processor until just fully combined, about 30 seconds.
When the egg white meringue has reached medium peaks (the elf hat stage) dump all the meringue out into a big clean mixing bowl, preferably a shallower, wider bowl. In three stages, pour one third of the dry mixture into the meringue and fold until 90% incorporated. After the last third of the dry mix is incorporated, continue to fold until the 'dark ribbon stage' appears and the looseness of the batter increases slightly.
Line a nice dry, flat sheet tray with your 'tracer sheet' and a fresh piece of brown parchment (the tracer sheet should be UNDER the fresh parchment). If you are using brown parchment on a roll, preflatten it under some books in advance. With a mediumsmall round piping tip (I use 805), pipe the macarons in line with the tracer sheet. Remember not to 'drown your tip' and to pull away from each macaron using the 'doggie tail wag' motion. Rest the macarons in a nondrafty place for 30 minutes.
This is a good time to make the ganache filling for the macarons. Scald the cream, pour over the combined chocolate, syrup, and salt. Stir until completely combined. Place the mixture over a double boiler on low heat and continue stirring if stubborn chocolate chunks remain. The mixture should be smooth and glossy, and thicken slightly. Pour the ganache on a sheet tray or casserole dish so that it's spread thinly for quick cooling.
Bake macarons in preheated oven at 325 degrees F for 4 minutes with the convection off. Turn the macaron pan and bake for another 7 minutes with the convection on. Wait until the macarons have cooled completely before attempting to peel them from the parchment.
Once the macarons are cooled, and the ganache has set to a spreadable consistency, spread or pipe about a half teaspoon of ganache onto half of the macaron shells. Use the other half of the cookies to complete the macaronganache sandwiches. Drizzle the macarons with extra melted chocolate if desired (drizzling with extra ganache is not recommended) or dust lightly with cocoa powder.
Macarons are always best the second day when 'matured' overnight in an airtight container in a refrigerator. They freeze really well in airtight containers as well. Always serve macarons at room temperature.