Nedre Foss Gård is along the river bank, and it serves lunch and dinner. And they have a microbrewery on the second floor! Their prices are a little higher than average for Oslo, but they make terrific food that's a mix of international, European, and Scandinavian cuisine. With a stylish old-school vibe, it's a great spot for a meal or drinks, especially in the summer when you can enjoy the outdoor seating with a view of the park.