In a heavy saucepan over medium heat, whisk together sugar, cocoa, and salt.

Add hot water and whisk until smooth.

Whisk mixture occasionally until it begins to boil.

Once boiling, whisk mixture constantly for two minutes.

Add Nutella, half and half, Frangelico and Marshmallow Vodka.

Whisk occasionally until heated through – do not boil.

Pour into mugs and serve.