Waldorf sorbet for a 40th birthday

Waldorf sorbet - celery and apple sorbet with celery and apple matchsticks and walnuts 

This was suggested as an intermediate sorbet course by the host of an event in May this year - his 40th birthday. Think he'd had it in a restaurant somewhere in the world (he was well travelled & dined). His guests had flown in from around the world too - America, Hong Kong, France etc. No pressure then!
Took the apple & celery sorbet recipe from here. Sceptical? Tastes absolutely amazing... but then I would say that.