kanoko mochi; mochi with red bean paste
A type of wagashi: soft mochi filled with sweet red bean paste (anko). The name comes from its resemblance to the spots of a fawn (kanoko).
I was served kanoko mochi with my tea.
The kanoko mochi from this Japanese confectionery shop has plenty of smooth red bean paste inside.
From 鹿の子 (kanoko, 'fawn') + 餅 (mochi), referring to the mochi's appearance resembling the spotted pattern of a young deer.