Dim sum refers to a style of Cantonese food prepared as small bite-sized or individual portions of food traditionally served in small steamer baskets or on small plates.
Eating dim sum at a restaurant is usually known in Cantonese as going to “drink tea” (yum cha, 飲茶), as tea is typically served with dim sum.
Mochi is Japanese rice cake made of mochigome, a short-grain japonica glutinous rice. The rice is pounded into paste and molded into the desired shape. In Japan it is traditionally made in a ceremony called mochitsuki.
While also eaten year-round, mochi is a traditional food for the Japanese New Year and is commonly sold and eaten during that time.