Peel the bananas and freeze them for 1-2 hours or overnight.
If you have pistachios in shells, crack the shells open and discard them.
Soak the pistachios in a bowl of warm water for at least 1 hour.
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{{/ items}} {{^ items}} {{/ items}}Now, add the drained nuts, frozen bananas, and lemon juice to a food processor. Blitz all until smooth and creamy.
Enjoy the gelato right away as a soft-serve ice cream.
For a more scoopable consistency instead, freeze the ice cream for at least 3 hours.