Ingredients

• 2 1/2 cups cold water, divided
• 1 cup white sugar
• 1/4 cup fresh mint leaves (optional)
• 1 lemon, zested, or more to taste
• 1 cup fresh lemon juice
• 1/2 cup limoncello liqueur

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Instructions

1. Combine 1 cup water, sugar, and fresh mint leaves in a saucepan over medium heat. Bring to a light boil, stirring occasionally, until sugar is dissolved, about 5 minutes. Remove from heat; stir in lemon zest. Let syrup cool slightly, about 10 minutes.
2. Mix remaining 1 1/2 cup water, lemon juice, and limoncello liqueur into syrup.
3. Pour mixture into an ice cream maker; churn according to manufacturer's instructions, 10 to 15 minutes. Freeze until firm, about 6 hours.