Kagamibiraki is an event held to wish for a peaceful year for the family by cutting a kagamimochi (a large, round rice cake) offered to Toshigami (a god of the incoming year) at the New Year, cooking it in zoni (vegetable soup containing rice cakes) or shiruko (sweet red-bean soup with pieces of rice cake), and eating it.
鏡開き（かがみびらき）とは、正月に年神に供えた鏡餅を割り、雑煮や汁粉に入れて食べ、一家の円満を願う行事である。