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ISINGLASS JELLY (Invalid Cookery)
A pleasant and nourishing jelly is made by boiling isinglass shavings and a portion of the brown crust of a loaf seasoned with Jamaica peppers. To an ounce of the shavings and a quart of boiling water, add a tea-spoonful of Jamaica peppers, and the bread-crust, which should be brown, but not black. Boil until it has wasted a pint. This jelly will remain good for some time. A spoonful may be put into soup, tea, or any other beverage. Probable cost, 1s. 2d.
A restorative jelly from the sickroom chapter: fish gelatin, water, toasted bread and allspice, reduced by half and kept as a concentrate to be stirred by the spoonful into soup or tea. A few of its terms need translating before it makes sense at a modern stove.
- IsinglassDried collagen from the swim bladder of sturgeon and other fish, sold in shavings or leaves and used as a setting agent before commercial gelatin became cheap. Food-grade isinglass is now mostly a brewing and winemaking clarifier; ordinary leaf or powdered gelatin is the practical stand-in, though isinglass was generally reckoned the stronger setter weight for weight, so 1 oz of shavings may go further than 1 oz of modern gelatin.
- Jamaica pepperAllspice, the dried berry of Pimenta dioica — not peppercorns and not a blend. A teaspoon of whole berries to a quart is the sense of it; strain them out with the bread before the jelly sets.
- "Wasted a pint"Reduced by half: a quart is two pints, so boiling until a pint has gone leaves a pint behind. Do it at a bare simmer — a hard boil drives off water faster than the isinglass can dissolve and risks scorching the crust.
- The crust"Brown, but not black" is the hinge. Toasted crust gives colour and a malty flavour; any carbonised patch turns the whole quart bitter, and the bitterness cannot be strained out.
- StrainingThe recipe assumes it, though it does not say so. Pour through muslin or a fine sieve while hot, before the gelatin begins to set, or the finished jelly is full of sodden bread.
- Yield and useAbout a pint of stiff jelly, meant to be kept cold and spooned out a little at a time — a spoonful dissolves into hot soup, beef tea or a cup of tea. It is a concentrate, not a dessert jelly.
- Keeping"Will remain good for some time" reflects a cold larder and a household that finished it within days. It is a low-acid, unsweetened, unsterile gel with nothing to inhibit bacteria: refrigerate it, covered, and treat it like fresh stock rather than a preserve.
Isinglass reached British kitchens as a byproduct of the Russian sturgeon trade and served for a long period as a standard gelling and clarifying agent — for jellies, blancmanges, and for fining beer, a use that survives in some cask ales today. Its appearance here, in the invalid cookery pages, belongs to a medical logic that ran through Victorian household books: illness was thought to waste the body's substance, so the sickroom diet was built on concentrated animal matter in the blandest, most swallowable form — beef tea, arrowroot, calf's-foot jelly, isinglass jelly. The bread crust and allspice do the work that salt and stock would do in a kitchen recipe, supplying colour and a suggestion of flavour to something otherwise nearly tasteless. Cheap manufactured gelatin is often said to have displaced isinglass in ordinary cookery, but the older ingredient seems to have held on longest exactly where this entry places it: at the bedside, where its reputation for purity and nourishment still counted.