In reply to ralphio:
Popcorn and the bar under the Hotel Dom (where old Popcorn was) can get quite lively (for Saas Fee!) and Happy Bar at the S Grund end of the village is worth a look too.
Rasso does a good chicken and chips with salad which isn't too pricey from memory. Alternatively, the butcher opposite does good rotisserie chickens to take away but you have to pre-book the day before as they're popular!
It's not cheap but as others have said, if you're on holiday...
Have fun,
Pete