I have just spent some time looking for this, so I have copied it here to make it little easier to find.
LIMONCELLO SORBET
2 cups of Ice Cubes
1/2 cup of sugar
zest of 1 lemon,
120mls frozen lemon juice
120mls Limoncello
Place sugar and zest in TM bowl for 10 seconds on speed 9
Add frozen lemon juice and half the ice cubes. Slowly turn speed dial to 10. Add remaining Ice cubes and Limoncello after 20 seconds and blitz for 1 min. Sorry didn't write down the weights (g) when converting recipe.
Enjoy