Try the restaurant at Norway [Restaurant Akershus]. Unless the park is crowded and/or it's eating time on the dot, you may not have to wait at all. And it's a buffet, so you don't have to wait long to be served. [And serving size won't be an issue ... until you try to waddle back out thru the doors after you've finished.]
And the food is great! [Beware that I'm not a con-no-sewer or anything like that!]
Around $12 lunch or $18 dinner, I think.
Don't miss the cream of mushroom soup! Or the shrimp salad. Or the smoked salmon and mackeral, or *any* of the meat dishes [pork, lamb, beef]. Or the meatballs!!!
Or the school bread.
Oh, desserts, too! Especially the rice cream!!!!!!
Good thing it's only 2 weeks til I'm there again ... I'm getting hungry!