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Coffee Jelly
Soak I box of gelatine in 1 cupful of cold water until soft. Add 1 cupful of sugar, 1 pint of boiling water and 1 pint of rather strong coffee. Stir until the sugar is dissolved, add 1 teaspoonful of vanilla extract, strain through doubled cheese-cloth into wet molds. Serve with soft custard or whipped cream.
A straightforward molded gelatin dessert whose only real puzzle is the vintage measurement in the first line. Get the gelatin quantity right and the rest follows.
- "1 box of gelatine"A box of granulated gelatin in this period is generally reckoned at about 1 ounce, which corresponds to roughly four of the quarter-ounce envelopes sold today, so four is a reasonable substitution. That gives about 1 ounce of gelatin to five cups of liquid (1 cup cold water, 1 pint boiling water, 1 pint coffee) — a firmer set than the modern one-envelope-per-two-cups rule, which is what lets it stand up when turned out of a mold.
- Bloom, then dissolveThe cold-water soak is not optional softening, it is blooming: the granules must swell before they meet heat or they clump into rubbery threads. Ten minutes is enough. The pint of boiling water is what actually dissolves them.
- "Rather strong coffee"Brew it noticeably stronger than you would drink it, since sugar and dilution flatten coffee flavor. Drip coffee at about one and a half times normal strength, or diluted espresso, both work. Cold brew gives a smoother, less bitter jelly.
- Why strainDoubled cheesecloth catches coffee grounds, sediment and any undissolved gelatin. In a clear jelly these show as cloudiness and grit, so do not skip it even with filtered coffee.
- Wet moldsRinsing the mold in cold water and leaving it wet stops the jelly gripping the sides, so it releases cleanly. To unmold, dip the mold briefly in warm — not hot — water and invert onto a wetted plate, which lets you slide the jelly into position.
- Chilling timeThe recipe gives none. Allow at least four hours in the refrigerator for individual molds and six to eight for a single large one; overnight is safest for anything you intend to turn out.
- YieldRoughly five cups of liquid, which serves six to eight. The soft custard the recipe suggests is a thin pouring custard (crème anglaise), not a set one.
Coffee jelly belongs to the great age of molded gelatin desserts that followed the arrival of cheap, reliable granulated gelatin in American kitchens in the 1890s. Sheet and shred gelatines had been sold commercially for decades before that, but many cooks still extracted gelatin themselves by boiling calves' feet or isinglass for hours, which put jellies firmly in the category of rich-household cooking; granulated gelatin made them far easier to attempt. Jellies flavored with coffee, wine or fruit juice appear throughout late Victorian and Edwardian American cookbooks, usually served with a custard sauce or cream to soften the plain sweetness. The dish also traveled: coffee jelly is now far better known in Japan, where its arrival is usually associated with the cafés of the early twentieth century, and it remains a standard café and convenience-store dessert, long after it faded from tables in the country these books were written for.