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Lemon Jelly
1/2 box or 2 tablespoons gelatine 1 cup cold water 1 cup lemon juice 1½ cup boiling water 3/4 cup sugar Soak the gelatine in the cold water for five minutes; then pour on the boiling water; add the sugar and stir until dissolved and cooled. Then add the lemon juice; strain through sterilized cheesecloth and set aside in a cool place until stiff.
A plain gelatine dessert of the sort every early-twentieth-century household book carried. The proportions still work, but the gelatine measure and the sugar level both need attention.
- "Half a box" of gelatinePeriod boxes were commonly sold in envelopes of roughly 1/4 oz, so half a box works out at about 1/2 oz, which is consistent with the two tablespoons given. Roughly 1/2 oz of granulated gelatine will set 3 1/2 cups of liquid firmly enough to unmould, though the cup of lemon juice makes for a slightly softer set.
- Bloom, then dissolveFive minutes in cold water is the minimum; give it ten and let it fully swell before the boiling water goes on. Undissolved granules are the usual cause of a grainy or weeping jelly.
- Do not boil the gelatinePour boiling water onto the bloomed gelatine off the heat and stir. Gelatine held at a hard boil loses setting strength.
- Add lemon juice coolThe recipe has you cool the mixture before the juice goes in. Prolonged heat with acid can weaken the set somewhat, and adding the juice cool also preserves the fresh top notes of the lemon.
- SugarThree-quarters of a cup against a full cup of lemon juice is sharp by modern taste. Between one cup and one and a quarter cups suits most palates; taste the syrup before the gelatine sets.
- StrainingCheesecloth catches pulp, pips and any undissolved lumps, which is what gives a clear set. A fine mesh sieve lined with a coffee filter does the same job.
- SettingA "cool place" meant a larder or icebox. Four hours in the refrigerator will set it; overnight is better if you mean to turn it out of a mould.
- YieldAbout 3 1/2 cups, which serves six in small moulds or glasses. Dip a mould briefly in warm water to release.
Clear lemon jelly was a showpiece dish that granulated gelatine made ordinary. Before commercial gelatine, a cook wanting this effect boiled down calves' feet or isinglass and clarified the result with egg white — a day's work, and the reason moulded jellies signalled a well-staffed kitchen. Packaged sheet and granulated gelatine, widely available in American groceries by the 1890s, collapsed that labour into a five-minute soak, and instructional books of the kind the recipe is often said to come from treated the technique as a basic lesson: master a plain lemon jelly and you could go on to fruit-studded moulds, Bavarian creams and charlottes, richer preparations that begin from the same command of setting gelatine. The sterilized cheesecloth is a mark of its era too, when domestic-science writers were pressing sanitation on home cooks alongside chemistry.