Do you know when the frozen food started to be recognized ?

It is said that it came from the frozen strawberry for jam in Colorado, U.S.A. in the early 1960's.

In Japan, frozen food started to be recognized at the first time in the Olympic Game held in Tokyo in 1964, and then it came to be more spotlighted in the Expo held later in Osaka.

Now, as you know, it comes to be indispensable for our modern life