It's the season for being outdoors. Head for the hills, the beach, the nearest park or perhaps just a deck chair on your veranda. There's only one question: who's making the sandwiches?

Not so very long ago, even in Tokyo, when you wanted anything half decent as a filling between slices of good, wholesome bread, then you had to buy the ingredients yourself and prepare your supplies at home. These days, there's a burgeoning and highly welcome artisanal sandwich movement — in the capital, at any rate.

Some of the shops propelling this are bakeries, adding extra value to the output of their own ovens. Others prefer to focus on the fillings, and leave the baking up to the specialists. And then there are the cafes whose well-crafted sandwiches are the central part of their appeal. Here are six that are well worth knowing about.