01 -
Whisk the sugar, dextrose, skim milk powder, stabilizer, and salt in a bowl until evenly combined and free of lumps.
02 -
Add the whole milk and heavy cream to a medium saucepan. Warm over medium-low heat until steaming, then whisk in the dry mixture slowly.
03 -
Bring the mixture to a gentle simmer for 1 minute, whisking often. Reduce the heat to low and cook for 8-10 minutes, stirring every few minutes, until slightly thicker.
04 -
Place the creme fraiche in a heatproof bowl. Pour in the warm dairy base and whisk until smooth. Blend briefly with an immersion blender if needed.
05 -
Set the bowl over an ice bath and stir until cool. Cover and refrigerate for at least 4 hours, or overnight, until very cold.
06 -
Whisk the cold base, then add the lemon juice, limoncello, and lemon zest. Mix until fully combined.
07 -
Pour the base into an ice cream maker and churn according to the machine directions until thick and creamy, usually 20-25 minutes.
08 -
Transfer to a chilled airtight container. Press plastic wrap onto the surface and freeze for at least 2 hours before serving.