If you are exploring downtown Oslo and feeling hungry in between seeing all the main sights, I have the solution for you. There are lots of restaurants and fast food places around, but maybe you want something cheaper and healthier? Head to Kvadrat Salat in Prinsens gate, one of the parallel streets to Karl Johans gate.
Kvadrat Salat is a small place, with takeaway only. It is a salad bar, so you walk around and compose your own salad which you pay for by weight. They have a lot of delicious ingredients, from raw veggies to hummus, grilled veggies, sun-dried tomatoes, and other yummy things, not just your usual Greek salad! They also offer fresh focaccia bread and a variety of drinks.
It is very popular around lunch, but it is worth the wait and the ingredients are always fresh. When you have picked out your favourites, you can take your salad to a bench nearby or walk down to the waterfront to enjoy lunch with a sea view.