1. Blend coffee beans with water on high for 6 minutes. It should be hot and steaming.
2. Strain the coffee through a filter for better texture.
3. Add coffee, ice, milk, condensed milk, hazelnuts and ¼ cup Nutella into blender and mix on high speed until smooth and ice is completely crushed. Pour into glass.
4. Blend reserved Nutella and melted butter until smooth sauce is formed.
5. Add whipped cream and drizzle on Nutella sauce. Garnish with hazelnuts.