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Sago Jelly
Take one pound of sago and five pints of water. Wash the sago well, then boil it with the water till it is reduced to a transparent jelly. The preparation may be flavoured to taste.
A two-ingredient invalid dish that depends entirely on technique: the sago must be cooked long enough for every pearl to lose its opaque centre, or the jelly sets cloudy and gritty.
- The hinge: cook to full transparencySago is done only when no white speck remains in the middle of any pearl. Pull it early and the jelly is chalky; there is no fixing it once cooled. Expect 30 to 45 minutes of gentle simmering for whole pearls, less for small ones.
- PintsIf the pint here is imperial (20 fl oz), five pints is 100 fl oz, or about 12 US cups (roughly 2.8 litres). Measuring in US pints would give you a noticeably stiffer jelly.
- Scale it downA pound of sago and three litres of water is a sickroom-sized batch that will fill a large stockpot. A quarter of the recipe — 4 oz sago to 25 fl oz water — is plenty for four servings.
- Buying sagoTrue sago pearls come from palm starch and are sold in Asian and South Asian groceries. Tapioca pearls, from cassava, behave almost identically here and are easier to find; small pearls dissolve faster than the large boba type, which stay chewy.
- Washing, and whyRinsing in a sieve under cold water removes loose surface starch that would otherwise make the finished jelly gluey and dull. Do not soak it for hours unless you want the pearls to break down completely.
- Stirring and the panSago sinks and scorches. Use a heavy-based pan, keep the heat low once it thickens, and stir often with a wooden spoon, particularly in the last ten minutes when the mixture is thickest.
- Flavouring, since the original declines to sayLikely period options include sugar with lemon juice and pared zest, a stick of cinnamon, a spoonful of sherry or Madeira, or milk in place of some of the water. Add sugar and acid near the end; acid early on can hinder the starch from swelling.
- Setting and servingIt thickens as it cools; depending on how far it has reduced it may set firm enough to turn out of a wetted mould, or stay soft enough to want individual glasses. Serve within a day or two, chilled and covered; it stiffens further in the refrigerator and can be loosened with a little hot water.
Sago is starch extracted from the pith of the sago palm, chiefly Metroxylon sagu of island Southeast Asia, and it reached Victorian Britain as small hard pearls sold by the grocer. Dishes of this kind were classed less as desserts than as invalid cookery: bland, easily digested starch thinned with water was what nineteenth-century household manuals prescribed for the sick, the convalescent and the very young, alongside arrowroot, gruel and beef tea. The instruction to flavour "to taste" is characteristic of that use — the same pot could be sweetened with lemon and wine for one patient and left almost plain for another. Sago's retreat from British kitchens in the twentieth century is often attributed to tapioca, a cheaper cassava starch that looks and cooks much the same way.