In a medium bowl whisk together the milk, sweetened condensed milk, and lemon zest. Cover and chill in the refrigerator for at least 1 hour.
Stir the lemon juice into the milk mixture. If the mixture curdles, then whisk it vigorously to make it smooth again.
Pour the mixture into your ice cream machine and freeze according to the manufacturer’s instructions.
Serve immediately or transfer the sherbet to an airtight container and freeze until ready to serve.
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Notes
SERVE OR FREEZE: Enjoy fresh from the ice cream maker for a soft, creamy texture. Or freeze for two to three hours for a firmer texture.STORE: Store the lemon sherbet in an airtight container in the freezer for up to two weeks.THAW: Let sit at room temp for 5–10 minutes before scooping for a perfectly creamy texture.