Traditional Okinawan Diet – What were they doing to those sweet potatoes?

Hey there!

Roughly [70 percent of calories](https://nutritionfacts.org/video/flashback-friday-the-okinawa-diet-living-to-100/) in the traditional Okinawan diet were from sweet potatoes.

My question: *How were they preparing those things?* What were the actual meals, based 70 percent on sweet potatoes, like?

Thanks in advance for any ideas!