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TAPIOCA JELLY
One half pint tapioca, one quart water, juice and some of the grated rind of a lemon; soak the tapioca for three or four hours in the water, sweeten it and boil for one hour in a custard-kettle, or until quite clear, stirring it often. When almost done, stir in the lemon, and when sufficiently cooked, pour into molds. Serve with sweetened cream.
A plain invalid-cookery jelly that depends entirely on the tapioca turning fully translucent. The main adjustment is the grade of tapioca available now.
- Half a pint of tapiocaA half pint is one cup by volume, not weight. With one quart of water that is a 1:4 ratio of tapioca to liquid.
- Which tapiocaThe book means pearl tapioca, the hard opaque beads that need long soaking. Instant or "minute" tapioca is precooked and granulated; it will dissolve into paste well before the hour is up and cannot be substituted measure for measure. Small pearl tapioca soaked as directed may well clear before the full hour is out, so go by the look of it.
- Custard-kettleA double boiler. The insert sits over simmering water so the starch never scorches on the bottom, which matters here because the mixture is stirred often but cooked long.
- Cook to clear, not to the clockThe hinge is the phrase "until quite clear." Each pearl should lose its white opaque centre entirely. A chalky core means raw starch and a gritty jelly, and no amount of chilling will fix it.
- Lemon lastAcid added early weakens starch thickening. Stirring in the juice and rind near the end, as written, protects the set and keeps the flavour bright rather than cooked-out.
- SweeteningNo quantity is given. About 1/3 to 1/2 cup sugar for the quart suits modern palates.
- MouldingRinse the moulds with cold water before filling so the jelly releases. It needs several hours cold to set; it will always be tender, closer to a loose pudding than a gelatine jelly.
- YieldAbout a quart, or four to six small moulds.
Tapioca is starch extracted from cassava root, imported into nineteenth-century American kitchens as hard dried pearls and treated as a near-medicinal food: bland, easily digested, and thought suitable for people who could keep down little else. Such recipes were commonly grouped with invalid cookery rather than among the desserts, alongside gruels, beef teas and arrowroot puddings, and household manuals of the period treated invalid cookery as a distinct branch of the art, since long convalescence at home was ordinary and the cook, not a hospital, was responsible for feeding the patient. The lemon here does double duty, cutting the flatness of plain starch and supplying a flavour widely held at the time to be refreshing to the feverish.