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Strawberries, Bottled
Gather the strawberries in dry weather when they are ripe, but not over-ripe. Pick them without bruising them, and put them into perfectly dry wide-mouthed bottles. Shake them down, and fill the bottles with clear syrup made by boiling three-quarters of a pound of refined sugar with half a pint of water. Cork the bottles tightly, and tie them down with string. Wrap straw round them to keep them from being broken, and put them into a large stewpan with cold water up to their necks. Let the water be made to boil, then draw the pan to the side, and let it simmer gently for ten minutes. Take the pan off the fire, and leave the bottles untouched till they are cold. Refit the corks, tie them down again, if necessary wax them over, and store for use. Time to simmer, ten minutes.
This is a Victorian bottling method, and the problem is the closure rather than the fruit. A cork held down with string and sealed with wax cannot form or hold the vacuum that safe preserving depends on, and the ten-minute simmer described here is a process with no measured temperature, no headspace and no way to verify a seal.
- The seal is the failure pointCorks tied with string will pass air and microorganisms as the bottles cool and the contents contract. Wax over the top hides leaks rather than preventing them; there is no way to confirm whether a bottle has sealed or has quietly drawn in air.
- Ten minutes at a bare simmer is not a processThe instruction is to draw the pan aside and let it simmer, which means the contents of the bottles never reliably reach or hold a known temperature. Modern fruit preserving specifies a full boil, a timed hold and an altitude adjustment because those numbers are what make the process repeatable.
- Spoilage risk, and what kindStrawberries are high-acid fruit, so the dominant hazard is yeast and mould rather than Clostridium botulinum. But fruit bottled in a sugar syrup and stored for months in an unsealed vessel can ferment, and a bottle that has drawn in air may show little or no sign of it before it is opened.
- Bottles in a stewpanThe straw wrapping is there because thin nineteenth-century glass cracked against the pan and against its neighbours. Ordinary bottles are not made to be heated and cooled under pressure differentials and can fail abruptly.
- What the measurements meanHalf a pint is an imperial half-pint, 10 fl oz or about 285 ml, boiled with three-quarters of a pound of sugar for a heavy syrup. "Refined sugar" here means white sugar rather than a less purified grade.
- If you want bottled strawberriesUse a current tested recipe from a preserving authority, with proper jars, measured headspace and a timed boiling-water process.
Bottling fruit in syrup was the standard nineteenth-century way of holding soft summer fruit through the winter. The technique descends from the French practice generally traced to Nicolas Appert's work on sealed vessels heated in water at the start of the century; British domestic manuals absorbed it quickly, but home cooks were still working with corks and wax long after commercial canners had moved to soldered tin and screw-topped glass. The insistence on dry weather, dry bottles and unbruised fruit is what can be done without a reliable seal: reduce the microbial load going in, because nothing in the process afterwards will be strong enough to correct for it.