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Sliced Mustard Pickles for Winter: Safe Canning Recipe
Instructions
Prepare the jars and ingredients. Wash seven to nine 475–500 ml jars, check their rims and sterilise them because the shortest processing time is only five minutes. Prepare the lids according to the manufacturer’s directions. Place a rack in a deep canner and begin heating the water.
Slice the cucumbers. Wash every cucumber thoroughly under running water. Remove about 1/16 inch from the blossom end, where softening enzymes are concentrated. Cut the cucumbers into even rounds approximately 1/4 inch thick.
Hold under salt and ice. Transfer the slices to a large non-reactive bowl and sprinkle evenly with salt. Cover them with about 2 inches of crushed or cubed ice. Refrigerate for 3–4 hours, adding ice if necessary. Drain away all liquid and let the cucumbers drain thoroughly.
Make the clear mustard syrup. In a large stainless-steel pan, combine the sugar, 840 ml of 5% vinegar, celery seed, whole allspice and whole mustard seed. Heat slowly, stirring until the sugar dissolves, and bring the liquid to a full boil.
Heat the cucumbers in the syrup. Carefully add the drained cucumber rounds to the boiling liquid. Heat slowly and turn the slices from the bottom occasionally so they warm evenly. As soon as the mixture returns to a boil, begin packing; prolonged cooking will soften the cucumbers.
Fill the hot jars. Pack hot cucumber slices into hot jars and cover them with boiling syrup, leaving 1/2 inch headspace. Slide a plastic utensil around the inside to release air bubbles, recheck the headspace, wipe the rims and apply the lids without overtightening.
Process in boiling water. Place the jars on the rack and cover them with at least 1–2 inches of water. Once a full rolling boil returns, process for the time in the table below. Turn off the heat, remove the canner lid and wait five minutes. Lift the jars upright and leave them undisturbed for 12–24 hours; do not invert or wrap them.
Processing time by altitude
Begin timing only after the water has returned to a full boil. These times apply to hot-packed 475–500 ml jars.
| Altitude | Processing time | Note |
|---|---|---|
| 0–1,000 ft | 5 minutes | Sterilise the empty jars first |
| 1,001–6,000 ft | 10 minutes | Maintain a continuous boil |
| Above 6,000 ft | 15 minutes | Do not increase the jar size |
Why this recipe contains no oil or mustard powder
Many home recipes use vegetable oil, garlic and dry mustard, but the processing time from one pickle formula cannot safely be transferred to an arbitrary thick mixture. This version keeps the research-tested quick sweet pickle formula: cucumbers, 5% vinegar, sugar, salt and whole spices. Mustard seed provides aroma without making the liquid cloudy or thick.
If you want a different flavour, open a finished jar, season one serving with a little oil, fresh garlic or hot mustard, and keep that mixture refrigerated. For a classic whole-cucumber preserve, use the recipe for pickled cucumbers in a one-litre jar.
How to keep sliced pickles crisp
- Choose pickling varieties. Fresh, firm 3- to 4-inch cucumbers have fewer large seeds and keep their shape better.
- Remove the blossom end. A thin 1/16-inch slice removes the main source of softening enzymes.
- Do not skip the ice. Cold salting draws out some moisture and helps strengthen the texture.
- Do not boil for long. Pack the cucumbers as soon as the mixture returns to a boil.
- Let the flavour mature. After 4–5 weeks, the sweetness, acidity and mustard aroma become more evenly balanced.
For a gentler sweetness and a different cut, see Finnish cucumbers for winter. It uses a different flavour balance, so do not mix proportions between the two recipes.
Storage and spoilage signs
After the jars have cooled completely, remove the screw bands, check the seals, wash the jars and label them. Store them in a cool, dry, dark place without large temperature changes. Best quality lasts about 12 months. Refrigerate every opened jar.
Do not taste the contents if a lid is swollen, leaking or unsealed, the liquid is foamy, the food smells unusual or the slices are slimy. Discard the entire jar.
Nutrition and serving ideas
A 100 g serving with some syrup contains approximately 55 kcal. The actual value depends on how much sweet liquid is served. Pair the pickles with potatoes, meat and sandwiches, or chop them into salads and homemade burgers.
Recipe video: Sliced mustard pickles for winter
Important: The video complements this recipe. Use the exact quantities, temperature, timing and storage guidance in this article, as the creator's version may differ.
The hero and step images were created with AI and are used as visual guides. Follow the stated weights, vinegar acidity, headspace and processing times rather than estimating ingredient quantities from the pictures.
FAQ
Can I replace mustard seed with mustard powder? +
No. The research-tested formula uses whole mustard seed. Powder thickens the liquid and changes heat penetration, so it is not an appropriate substitution for shelf-stable jars.
Can I use 9% vinegar instead of 5% vinegar? +
Use commercially made vinegar labelled 5% acidity. Do not dilute 9% vinegar by eye or reduce the acid volume, because that would change the tested ratio of pickling liquid to vegetables.
Do sliced mustard pickles need vegetable oil? +
No. This version contains no oil: the clear syrup is made from 5% vinegar, sugar and whole spices. That keeps the acidity predictable and avoids an oily film on the cucumbers.
How long should sliced cucumber jars be processed? +
For hot-packed 475–500 ml jars, process for 5 minutes at 0–1,000 ft, 10 minutes at 1,001–6,000 ft or 15 minutes above 6,000 ft. Start timing when a full boil returns.
Can I cut the cucumbers into strips instead of rounds? +
Yes. The tested quick sweet pickle method permits slices or strips. Keep the pieces uniform so they salt, heat and pack evenly without leaving large spaces in the jars.
Why are the cucumber slices held under salt and ice? +
Salt draws out some moisture while the ice keeps the cucumbers cold. After 3–4 hours the slices hold their shape and crunch better, but all released liquid must be drained away.
How long do sliced mustard pickles keep? +
Properly processed sealed jars retain their best quality for about 12 months in a cool, dark place. Refrigerate the pickles after opening and always use a clean fork.
Why should the jars rest for 4–5 weeks before serving? +
During that time the acid, sugar and mustard aroma distribute evenly through the slices. The pickles may be eaten sooner, but their most balanced flavour develops after roughly one month.
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