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Coffee Jelly (Box or tablespoon gelatine cup)
1/4 box or 1 tablespoon gelatine 1/4 cup cold water 3/4 cup boiling water 1/4 cup sugar 1 cup strong coffee Soak the gelatine in the cold water for two hours; add the boiling water and sugar and stir until dissolved; then add the coffee; Family of Fou strain through cheesecloth into a wet mold and stand away until the following day. Serve with whipped cream.
A four-ingredient gelatine dessert that depends almost entirely on the coffee. The proportions are sound for modern powdered gelatine, but the soaking time is not.
- "1/4 box" of gelatineA box of granulated gelatine held four envelopes, so a quarter box is one envelope — about 1/4 oz or 7 g, which matches the tablespoon given as the alternative. One standard envelope sets roughly 2 cups of liquid, exactly the volume here.
- Two hours is far too longBloom modern granulated gelatine in the cold water for 5 to 10 minutes, until it swells and looks like wet sand. The two-hour soak belonged to coarser early gelatine; leaving it that long now does no harm but no good either.
- Do not boil itAdd the boiling water off the heat and stir until no grains remain when you lift the spoon. Gelatine held at a rolling boil loses setting strength, and this recipe has no margin for error.
- Strong coffee means strongThe coffee is half the total liquid and is diluted further by the water, so brew it at double strength or use a short espresso topped to one cup. Weak drip coffee gives a jelly that tastes of sweetened water.
- The cheesecloth strainThis catches undissolved gelatine and coffee grounds, which is worth doing if you have brewed in a pot rather than through a filter. Skip it only if both liquids are visibly clear.
- A wet moldRinse the mold with cold water and pour the jelly in wet; the film of water lets the set jelly slide out. To unmold, dip the base in warm water for a few seconds and invert onto a chilled plate.
- "Stand away until the following day"In an unrefrigerated pantry this needed overnight. In a modern refrigerator it is firm in 4 hours, though overnight gives a cleaner cut and a better release from the mold.
- YieldAbout 2 cups, which serves four in small molds or ramekins. The stray words "Family of Fou" sitting in the middle of the instructions are intrusive text — most likely a running head or other page element that has slipped into the body — and are not part of the method.
- ServingWhipped cream, unsweetened or barely sweetened, is the point — the jelly itself is quite sweet and bitter at once. Chopping the set jelly and heaping it into glasses under the cream is a period presentation and hides an imperfect unmolding.
Coffee jelly belongs to the great age of gelatine cookery, roughly 1890 to 1930, when granulated gelatine sold in boxed envelopes put a molded dessert within reach of any household that had previously needed to boil down calves' feet for the same effect. Clear jellies were exactly the sort of cheap, showy, make-ahead dish such collections favored: four ingredients, no oven, and the work done the night before. The dessert survives in two places — as a nostalgic ice-cream accompaniment in New England, and much more robustly in Japan, where kōhī zerī arrived with Western dessert fashions and is still sold in cups in convenience stores.