It's literally just a Japanese-style square lidded bread pan. For one example (pardon the gross Amazon link): https://a.co/d/5omfwxk
Are you asking for real? They probably put it in an upsidedown box to let it rise and bake.
It's literally just a Japanese-style square lidded bread pan.
For one example (pardon the gross Amazon link): https://a.co/d/5omfwxk
There we go