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Frozen Sago Custard
Same as the tapioca custard. Steep the sago in cold milk first it will then cook in a few minutes.
A cross-reference entry rather than a standalone recipe: it assumes you have the tapioca custard formula in hand and only tells you the one thing that changes. What follows fills in what a modern cook needs around it.
- Read it with the tapioca custardThe proportions, eggs, sugar and freezing method all come from that recipe; this entry only substitutes sago for tapioca. Nothing here works on its own.
- What sago isStarch from the pith of the sago palm, sold as small hard pearls that look like tapioca and behave much the same. Health-food and Asian groceries stock it; pearl tapioca is the standard substitute and needs no adjustment beyond soaking.
- The soak is the whole pointDry sago dropped straight into hot milk tends to set into a lump with a chalky centre. Cold milk penetrates the pearl first, so the starch swells evenly and then gelatinises quickly, which is what the recipe means by cooking "in a few minutes." Half an hour or so in the cold milk before heat goes near it is usually enough.
- Use the soaking milkDo not drain the pearls; the milk they have been steeped in is part of the custard's liquid and should go into the pan with them.
- Cooked, not rawOnce the eggs go in, take the custard to about 175F on a thermometer, stirring, then strain and chill it thoroughly before freezing. Much above that and it will begin to curdle.
- FreezingA period recipe of this kind means a hand-crank freezer with ice and rock salt. An ice-cream machine gives the same result; a still-frozen pan needs vigorous whisking every 30 minutes or the pearls settle into a gritty layer at the bottom.
- Texture expectationsFrozen sago stays chewy where the surrounding custard is smooth, which is the intended effect and not a fault. Cook the pearls until fully translucent, though, since any opaque core reads as raw starch when cold.
- YieldWhatever the tapioca custard makes; this entry gives no quantities of its own.
Sago and tapioca arrived in nineteenth-century American kitchens as cheap imported starches, and cookbooks of the period often treat them almost interchangeably -- which is what this entry does, disposing of a whole dessert in two lines because the reader already has the tapioca version. Sago came largely from the palms of Southeast Asia and reached Western grocers as sorted pearls; tapioca is made from cassava, a South American plant, and reached Europe and North America through Brazil and the Caribbean. Both were valued as thickeners that did not require flour, and both appear frequently in the puddings and frozen desserts of the period.