Clarion Hotel Sign has both lunch and dinner options in the hotel bar and restaurant, The Snowball bar will also serve simple meals like wraps and salads during the evenings.

If you want to participate in the New Years Eve dinner on the 31st, have a look at the New Years Evening page >>

Stockholm has a variety of restaurants.  On the map you can find some options as well as information on the closest supermarkets and drugstores.