Do you know what kind of food this is?

This is a dish called Gamjatang.
In "Gamjatang," the word "gamja" does not refer to the actual potato but rather to "gamja-bone." Gamja-bone refers to a unique part of the pig's backbone, and this bone adds rich flavor to the broth. The name "gamja" has no relation to the potato, and in that region, the word "gamja" refers to this specific bone. Gamjatang is a dish made by boiling pig bones to make broth, and then adding gamja-bone or other meat cuts to the pot.