They came from Yamanashi Prefecture via Shin. Called 黒玉=kuro-tama, lightly sweetened green-pea paste balls are coated with brown sugar whose smooth surface might come from algae. Taste good in room temperature, while the best after getting out of refrigerator. More famous 信玄餅=Shingen-mochi is also accompanied by brown-sugar syrup, might be popular among natives.