Yamazaki is a somewhat fancy bakery that has outlets in lots of malls in Thailand. I was looking for something to take home for a "light" dinner yesterday and saw a "Piroshiki" that looked interesting. It was.
It did look like a piroshki, except that it was more pill-box shaped, not like the organic football, or turnover, shape of the Russian originals.
The filling tasted like a combination of BBQ pork, pickled vegetables, and tuna fish. It probably tasted better than it sounds, it was okay.
23 Baht (70 cents or so).