Fumio Kishida, the prime minister, reportedly intervened to ensure ingredients from Hiroshima are properly represented

G7 leaders will need gargantuan appetites when they meet in Hiroshima, where they will be treated to multi-course menus featuring regional produce that have reportedly been months in the making.

The provisional menus for the summit – copies of which have been seen by the Guardian – will include okonomiyaki, a signature Hiroshima dish that grew out of the destruction wrought by the August 1945 atomic bombing, and oysters, another local delicacy.