Doubtless there was some kind of cultivation: starchy yams and taro, in all probability originating with the continent, were being elevated, the starch from them shaped into a type of bread. This incipient agriculture appears to be connected to a cultural florescence in mid-Jōmon instances that lasted about 1,000 years. https://ananyaliperesort61479.mpeblog.com/52149779/shokupan-recipe-fundamentals-explained