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Wiesbaden Process
Measure out ten (pounds) quarts of fine, sound, deadripe strawberries. Prepare a syrup of five pints of strawberry juice made of sound, but not necessarily large, berries. In sorting over the berries lay aside all the smaller ones for juice. Add to the five pints of juice five pounds of sugar. Let the sugar melt and come to the boiling point, and boil seven minutes. Skim off any froth that rises. Fill ten well-sterilized cans with the fresh strawberries that were prepared for preserving. Cover them with the syrup made of the juice and sugar. Put on the covers closely, but leave off the rubbers, or if the cans are the patent ones leave the vent open. Set the cans on a wooden rack, fitted in the bottom of an ordinary flat-bottomed boiler. Place kitchen towel between the cans to prevent their knocking together. Fill the boiler full of hot water to the necks of the cans. Let the canned strawberries remain in the water, after it begins to boil for seven minutes. The strawberries should have all risen to the top of the jar, and absorbed some of the syrup, and there will be a space for more syrup. Fill the cans up to the brim quickly with some of the syrup left and brought forward and boiled, and instantly put on the rubbers and screw on the covers as tightly as you can. Tighten them again when they are cold, and wrap each one in paper and set them away in a dry cool place where the temperature does not rise above 70 degrees.
This is a turn-of-the-century whole-berry canning method, and while the reasoning behind it is sound for its day, the sequence of steps does not produce a reliably sealed jar by any current standard. The notes below explain the vocabulary and where the process breaks down.
- The failure is in the last stepThe jars are processed with the closures loose, then topped up with additional syrup and sealed afterwards. The recipe does say the extra syrup is brought forward and boiled, but the ladle, the jar rim and the air are not processed, and the seal that forms is a hot-fill seal of unknown quality rather than one created and tested under heat. Spoilage organisms introduced at that moment are sealed in with the fruit.
- Seven minutes is a fruit-heating time, not a process timeThe seven minutes counted from boiling is enough to soften the berries and drive air out of the jar, which is what the writer appears to have wanted. It is not a validated process for any jar size, and the only headspace instruction is to fill to the brim at the end, so there is no way to know what vacuum, if any, resulted.
- Why this is spoilage rather than botulismStrawberries sit around pH 3.3–3.5, well inside the high-acid range, and heavy sugar syrup lowers the water available further. Clostridium botulinum will not grow in that environment. What will grow is mould, wild yeast and acid-tolerant bacteria, which is precisely what an unreliable seal invites over months of storage.
- "Ten (pounds) quarts"The parenthesis stands in the text as printed; whether it is the author's own hesitation or a printing error cannot be settled from the page, and it is genuinely ambiguous. Ten quarts of hulled strawberries weighs roughly 12–14 lb, so the two figures are not interchangeable. The recipe fills ten cans, which suggests quarts of fruit for quart jars.
- "Cans" means glass jarsNineteenth-century American cookbooks call glass preserving jars cans. The rubbers are the gum rings that sat between jar and lid on Mason-type jars; the vented "patent" jars are one of several proprietary closures of the period, and the recipe does not say which. None of these seal the way a modern two-piece lid does, and the rubber rings themselves were a known point of failure.
- "Ordinary flat-bottomed boiler"The household wash boiler — a large oval tin or copper vessel used for laundry, pressed into service on canning day. The wooden rack and the towels between jars do the job of a modern canner rack, keeping glass off direct heat and stopping jars from knocking.
- Storage below 70 degreesCool storage slows any spoilage that does get going, and the paper wrapping keeps light off the fruit so it does not fade.
- If you want whole strawberries in syrupUse a current tested recipe from a source that specifies jar size, headspace and processing time for your altitude. Freezing whole berries in light syrup generally gives a better texture than canning, since heat softens strawberries.
The "Wiesbaden process" is one of a number of named preserving methods that appear in American cookbooks and household magazines of the period; the origin of the name and any connection to German practice are not established here beyond the town of Wiesbaden itself. The point of the method was to keep the berries whole. Ordinary strawberry preserving boiled fruit and sugar together until the berries collapsed into jam; here the sugar syrup is made separately from a pressing of the small, imperfect berries, and the good fruit is heated only briefly in the jar so it plumps and absorbs syrup rather than disintegrating. That thrifty split — best berries for show, culls for juice — belongs to a period when strawberries were a fleeting local crop rather than a year-round import. The loose covers, wooden racks and towels between the jars reflect the era's hardware: glass that cracked from thermal shock and rubber rings that perished, both of which the two-piece lid later addressed.