freeze it in ice cube trays, then reblitz it on speed 9/10 for about 30 seconds, should bring it back to like it was first made - always has in this house
I put mine in icy pole things with sticks in. Then if anyone wants one they eat it as an icy pole.
If the sorbet is only for adults then a tablespoon or two of a complementary flavoured liqueur or vodka will prevent it from freezing hard.