Roast the hazelnuts in a preheated oven at 200 degrees C for 8-10 minutes till the hazelnuts glisten with oil. Cool them down till they are warm to touch. Add them to the grinder and make it into a smooth butter.
Add the dates and cocoa and grind it into a smooth paste while scrapping the sides down. Do not add water.
Store in an airtight jar.
Variation
Add any extract as per your taste like vanilla, kesar, etc.