Hunger and famine are big risks during war. Which food was responsible for saving the most civilians from famine during WWII?
I would expect this wonder food to be cheap, healthy yet abundant to be useful during war.
Cheap because civilians were poor. Healthy because health facilities will be inferior compared to peacetime. Abundant because there were so many people to feed.
What was this wonder food, if it existed in history? Not easy to find food that fit the criteria.
The answer should mention the country as different countries may have different preferences of food.