If you're visiting a friend and are thinking of what to bring with you, consider a bento lunch! Bentos are a great way of giving someone a present, too. Apart from the gift of the food itself, you can also buy a bento box for the person to keep and re-use.
Yesterday I visited a friend and her 4 month old baby. As it is harder for her to go out, I made a bento lunch for both of us and brought it to her place. I made a western-style bento with tuna and salmon spiral pasta, meatballs and potato salad. For decoration, I cut out little carrot flowers and made an octodog (octopus-shaped frankfurter).