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Cereals (To cook cereals in the cooker)
To cook cereals in the cooker to best advantage there should be a double-boiler receptacle. Fill the large outer pail with water and bring it to a boil. In the upper vessel put the required amount of water; stir in the cereal; season to taste; heat and stir slowly until it begins to thicken-about ten minutes. Place the smaller kettle inside the larger and set away in the cooker; leave overnight and in the morning beat up well and reheat. If the grains are desired separate, cook a less time and do not beat.
This is a fireless-cooker method: the grain is heated on the stove, then sealed into an insulated box to finish on retained heat while the household sleeps. The technique is sound in principle, but cooked cereal held overnight in a slowly cooling box sits for hours in the range where Bacillus cereus thrives, and morning reheating does not undo it.
- Why the overnight hold failsA fireless cooker has no heat source. Its contents drop steadily through the 40-140F range over the course of a night, which is exactly the window in which Bacillus cereus spores, common on rice, oats, barley and wheat, germinate and multiply in cooked starch.
- Reheating does not fix itThe emetic toxin produced by B. cereus is heat-stable and survives boiling. "Beat up well and reheat" in the morning kills vegetative bacteria but leaves the toxin intact, which is why cooked grains left warm overnight are a recognised cause of foodborne illness.
- Not the same as a slow cookerA modern slow cooker has a continuous heat source and brings food up to and holds it at simmering temperatures (roughly 170-280F once it reaches heat). A retained-heat box only insulates; the two are often equated and should not be. Use a current stovetop or slow-cooker recipe for overnight porridge instead.
- What "the cooker" wasA fireless cooker of this period was a lidded wooden or metal chest packed with insulating material such as felt, excelsior or asbestos, sometimes used with a soapstone or metal disc heated on the stove and set in alongside the pot to extend the heat.
- "Pail" and "kettle"Both mean the fitted metal vessels sold with the cooker, not a teakettle. The arrangement described is simply a double boiler: outer pail of boiling water, inner pail of cereal.
- The grain in questionThe recipe names no grain, but the long overnight hold suggests whole or cracked grains of the sort that then took an hour or more of simmering. Quicker-cooking rolled cereals were developed to shorten exactly that cooking time.
- Grains separate versus beatenThe final line distinguishes pilaf-style separate grains from a beaten, creamy porridge. Beating a cooked cereal ruptures the starch granules and thickens it; that part of the instruction is still good practice.
Fireless or "retained-heat" cookery had a long folk history as the European haybox, and was promoted in American household manuals in the early twentieth century, first by domestic-science reformers as a labour saver and then, during the First World War, as a fuel economy. Overnight cereal was one of its showpieces: whole oats, cracked wheat and hominy all wanted an hour or more of simmering, and a cook who could put them to bed at night and find breakfast waiting had saved both coal and attention.