Coffee jelly (コーヒーゼリー kōhii zerii) is a popular gelatin dessert in Japan. It has the color and flavor of black coffee, though it is a somewhat translucent gel. It is often cut into cubes and served in a variety of dessert dishes and beverages. Cubes of coffee jelly are sometimes added to milkshakes, at the bottom of an ice cream float, or to garnish an ice cream sundae. Coffee jelly is often added to a cup of hot or iced coffee, with cream and gum syrup added to individual taste. In another rudimentary dish, condensed milk is poured over cubes of chilled coffee jelly in a bowl, and eaten with a spoon.
Coffee jelly can be made using instant mix or from scratch. It is served in many restaurants and cafés, and is sometimes a part of students' lunches served at public schools in Japan.
You can find coffee jelly in many sorts of American coffees, since they are now being served internationally.