In a medium bowl, combine milk, sugar, and salt. Stir with a wire whisk until dissolved.
Put Nutella in a small bowl and place in microwave for 10 to 15 seconds, or until soft but not melted. Add 1/4 cup of the half and half to Nutella and place back into the microwave. Heat another 10 to 15 seconds until warm but not hot. Whisk together until blended (may have some tiny pieces of chocolate). Add slowly to milk and sugar blend.
Stir in remaining half and half, heavy whipping cream, and vanilla. Pour into ice cream maker and follow manufacturer's instructions.
Makes 1 quart.
-Heywood C. Broun