Potato Three Brother

I've heard a lot about the legend of  “Potato Three  Brother” (薯条三兄弟). It’s a snack from Hokkaido, Japan.
Finally, I get to taste it by myself. It’s so tasty that I couldn't stop after the first bite!  What makes me so surprise is the chip is actually solid inside, not empty. Just like fries :)
And I heard there’s another version called “Potato Three Sister” (薯块三姐妹).
I wish I can try that too, yum, yum, yum...