Preheat your oven to a classic 350°.
Line a baking pan with some parchment paper. Aim to use a pan that’s roughly 12” x 17”. Don’t forget to grease up the parchment paper and the pan to avoid any sticking during the baking process.
Now, grab a big mixing bowl. In it, mix together your egg yolks and brown sugar. Keep that going at a “Medium” pace until the contents develop a creamy consistency and light texture. Which, in my experience, only takes a couple of minutes. At which point, you can add in your cannabis-infused butter, vanilla extract, and coffee. Mix all of those elements together as best you can.
Moving on, you’ll need another small bowl. In it, you’ll sift your all-purpose flour, salt, baking soda, baking powder, and ⅓ cup of cocoa. When those are adequately blended in with one another, you can add it into your egg yolk mixture. Keep the mixing going until everything is fully combined.
Next, grab another mixing bowl, and beat your egg whites until they get stiff and form peaks. When that happens, slowly toss in your sugar, but only do so one tablespoon at a time, as you continue to beat the contents. Keep that going until you develop a shiny series of stiff peaks.
When you see that, fold roughly one third of that egg white mixture into your egg yolk mixture. Once they are just mixed in with one another, fold in the remaining egg white mixture, and keep that going until you no longer see any streaks of the egg whites - but do not go crazy here. We don’t want to overmix things, so be strategic during this part of the process.
After that, you’ll take your batter, and pour it into that baking pan, and press on it a bit, to evenly distribute it throughout the previously-greased pan.
If your oven is ready, toss that in to bake for about 10 minutes. When the cake displays some “bounce” after being touched, you’ll know it’s time to take it out.
Meanwhile, grab a fairly large piece of parchment paper, and sprinkle it with the cocoa powder you have left. Aim to use a piece of parchment that is just a bit bigger than the baking pan you’re using.
Then, when your cake is good and ready, you can remove it from the oven, and loosen it from the pan with a knife along the edges. When it’s free from the pan, flip it onto that cocoa-covered parchment paper.
While it’s still warm, remove the parchment paper that the cake baked on, and use that new, cocoa-covered parchment to roll the cake. Set that newly-rolled cake onto a wire rack to cool, with its “seam” facing downward. Leave it there for at least a couple hours.