When picnic in the park, I often make my own sandwich kit. It's handy and you can make delicious sandwiches everywhere. Freshly baked bread is the key. Fortunately in Tokyo, there is a local bakery in almost any towns and I can easily find freshly baked breads. Grab a few slices of bread, tomato, lettuce, pastrami and anything you like to sandwich with, and pack them with butter, mayonnaise, ketchup, or any sauces you like. don't forget to take disposable knives and plates. As cherry blossom is in full bloom in the park, a piece of my own sandwich adds a relish to the picnic.