Refreshing lemon gelato swirled together with Limoncello.
In a medium bowl, combine lemon zest, fresh lemon juice, and granulated sugar. Stir until the sugar is fully dissolved.
Add heavy cream, whole milk, and vanilla extract to the lemon mixture. Mix well until all ingredients are combined.
Cover the bowl and refrigerate the mixture for at least 2 hours, or until it's completely chilled.
Pour the chilled mixture into an ice cream maker and churn according to the manufacturer's instructions until it reaches a soft-serve consistency.
Transfer the gelato to a lidded container and freeze for at least 4 hours, or until firm.
Once the gelato is firm, take it out of the freezer and let it soften slightly. Swirl in the Limoncello gently with a spatula.
Scoop the Limoncello gelato into flute glasses and serve immediately. Optionally, garnish with a lemon slice.