Language / Polish words difficult to translate into English [66]

I always find 'smacznego'* a bit tricky to translate, well I have settled for either:
1. enjoy your meal!
2. bon appetit!
The thing is, the first one doesn't mean exactly the same and the second one isn't really in English, is it :)

*smacznego - derived from the word smaczny/smaczna - tasty

Any thoughts on this one?