Japanese Coffee Jelly

Why this works

Coffee jelly works because of contrast, and the recipe is built to maximise it. The jelly is strong and barely sweetened, so it is properly bitter. The cream or condensed milk is cold and sweet. Each spoonful mixes the two in a different proportion, which keeps it interesting in a way a sweetened coffee pudding would not.

The choice of setting agent changes the texture. Gelatine is animal collagen. It sets soft and wobbly, and it melts at around 35°C, just below body temperature, so it dissolves on the tongue. That is the classic kissaten texture, and why the jelly is served cold and eaten quickly. Agar is a seaweed extract. It has to be boiled to dissolve, sets much more firmly, and does not melt until around 85°C, so it holds its shape at room temperature and in hot weather. It is crisper and less wobbly. Many Japanese home cooks use kanten, the traditional agar, for exactly that reason.

The coffee is brewed stronger than usual because cold, and sugar, and cream all dull its flavour. A normal-strength coffee sets into a jelly that tastes mild and slightly thin.

Coffee jelly appeared in Japanese cookery writing in the early twentieth century and became a staple of the kissaten, the traditional coffee houses, through the Showa era. It is still sold in every convenience store in Japan, and drinkable coffee jelly, cubes in a cup of sweet milk with a wide straw, is a popular modern variant.

Variations

• With condensed milk: 10 ml per glass, the sweeter version, close to Vietnamese flavours.
• Coffee jelly drink: cubes in a tall glass of sweet cold milk with a wide straw.
• With vanilla ice cream: a scoop on top of the cubes instead of cream.
• With agar: 2 g of agar powder boiled with the coffee for a firmer jelly that holds at room temperature.