Preheat the oven to 375℉
Add the dates to a bowl of warm water.
Spread the raw hazelnuts over a large baking sheet and roast for 10 minutes or until slightly darkened and aromatic.
Add the warm hazelnuts to a high speed blender and blend until a smooth butter forms, stopping to scrape down the sides as needed. This process might take 5 - 10 minutes.
Add the cocoa powder, dates, and sea salt and blend to incorporate.
While the blender is running, add water one tablespoon at a time until the mixture reaches your desired consistency. I added 5 tbsp to mine.
Store the homemade nutella in an airtight glass container in the refrigerator for up to 3 days. Enjoy!