How to Make It
Place hazelnuts in a heavy-duty blender; process until finely ground, scraping down sides with a spatula as needed. Add water, 1 tablespoon at a time, and process until nuts resemble wet sand.
Whisk together chocolate chips, milk, oil, cocoa, vanilla, and salt in a small saucepan over medium-low, whisking until melted.
Add melted chocolate mixture to nut mixture in blender, and process until combined and smooth. Add sugar; process until combined and smooth. Store in an airtight container in refrigerator.