For an even smoother gelato, consider using an immersion blender to blend the base after cooling and before chilling. The quality of your chocolate-hazelnut spread will significantly impact the final flavor, so choose a brand you enjoy. If you don't have an ice cream maker, you can still make a version of this gelato using the 'no-churn' method. Simply whisk the chilled mixture every 30 minutes during the first 2-3 hours of freezing to break up ice crystals.