6.
Matsutake Mushrooms
Number six on the list of most expensive food products in Japan had a decrease in production in the past decades and so the price went through the roof.
The Matsutake mushrooms where a very famous Japanese mushroom 30 years ago, but due to the fact that the environment is suffering, the production of these food items decreased.
These factors made this type of mushroom very rare and boosted its price very high.
So for a kilo of the Matsutake mushrooms you could pay $2000, a price that is made according to the quality of the mushroom and other factors.
So not only this type of mushroom is seasonal, but also Japan reported that their Marsutake mushroom productivity is less than a ton a year, making this one expensive Japanese delicacy.