Place dates, cashews, almonds, cocoa powder, shredded coconut, coconut oil, cold espresso, vanilla, salt, and cayenne in the bowl of a food processor. Pulse on and off to start, then process for about 1 minute. Check to ensure mixture is sticky and moist enough to come together. Add more coffee if needed. Continue to process until mixture becomes a chunky mass.

Line a baking pan with plastic wrap. Scoop mixture into pan. Press down with a spatula until mixture is even. Place a layer of plastic wrap on the surface and smooth again with your hands. Refrigerate until cold and firm, 2 to 3 hours.