Place the nuts together in a blender and mix until they obtain a breadcrumb-like texture.
Add the honey, peanut butter, and cocoa powder and blend until the mix becomes a paste. If the paste is too thick for the blender, mix by hand until homogenous.
Line a 20x30cm (7.5-11.5 inch) baking tray with plastic film. Put the mixture in the tray and press firmly. Cover with foil and refrigerate.
When hardened, remove from the fridge and cut into 24 pieces (about 50g or 1.75 oz each).
Store in a covered container in a cool place. Enjoy!