I'm in Norway, and tradition until relatively recently has been to bring a few slices of bread with ham, cheese, pate or whatever wrapped in paper. Sometimes left overs from dinner the day before. Almost always consumed in a canteen with your co-workers. More recently many work places have a canteen with both hot and cold food for a discounted price. If you don't have access to a canteen the shops sell relatively cheap sandwiches or micro wave lunches.