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Tomatoes Slices with Onions and Oil for Winter without Sterilization
Instructions
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I prepare the ingredients. The marinade calculation is for 1 liter of water — slightly more than 2 half-liter jars need, but it's safer to err on the side of extra brine. Since this is no-sterilisation, jar cleanliness is critical: wash with baking soda or mustard powder, then sterilise jars and lids by any method.
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Wash dense meaty tomatoes, cut out stems, slice into 2 or 4 pieces depending on size — uniform pieces look best in the jar.
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Onion slices into rings, then I separate the rings into individual circles.
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The jar bottom gets a layer of onion, peppercorns, sliced garlic, and dill. Note: the onion in this preserve emerges very tasty — perfect addition to winter salads as a separate ingredient.
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First tomato layer packs tightly but without crushing — gentle tapping the jar on the table settles them naturally.
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Second layer of onion + tomato fills the jar to the very top.
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Plain water boils and pours into the filled jars — this first pour pre-warms the contents.
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Lids cover loosely. Wait 15 minutes for the contents to fully heat through.
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After 15 minutes, drain the water back into a measuring saucepan — measures the actual marinade volume needed.
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Salt and sugar dissolve into the drained water (in the proportions for the actual measured volume).
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The marinade boils 2 minutes for full salt-sugar dissolution and minimal sterilisation.
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Vinegar adds at the very end — pot off heat. Late-stage vinegar preserves its acidic punch.
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1 tsp vegetable oil pours into each half-liter jar (1 tbsp for liter jars). The oil floats on top and creates an oxygen barrier that protects the preserve.
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Marinade pours over the oil to fill jars to the very top.
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Lids screw on tight, jars invert.
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Wrap inverted jars in a large towel or blanket. Leave until completely cool — at least 8 hours.Sliced tomatoes with onions and oil for winter store at room temperature for a year or more. The natural tomato flavour is preserved beautifully — these jars genuinely earn the description "pieces of summer in winter." The tomato pieces, the soaked onion rings, and the spiced marinade are all separately delicious — three preserves in one jar.
Tips
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1
THE OIL FLOAT IS A SAFETY MECHANISM. Step 13's oil addition isn't decorative — the floating oil layer creates an oxygen barrier between the marinade and the air, dramatically inhibiting mould and yeast growth at the surface. The 1 tsp per half-liter jar is calibrated to form a thin but complete oil seal. Less oil = incomplete coverage = mould risk. More oil isn't harmful but reduces the marinade volume.
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2
THE 15-MINUTE WARM-UP IS ESSENTIAL. Step 8's pre-heat step gently warms the tomatoes through their cell walls, opening them up for marinade penetration. Skip this step and the tomatoes don't fully infuse with the marinade — they emerge less flavourful. The 15-minute timing is calibrated for 0.5 L jars; larger jars (1 L) need 20 minutes. The pre-warm + drain + boil-back-in approach is universal for no-sterilisation preserves. For another no-sterilisation tomato preserve worth comparing, see Marinated Tomatoes for Winter Without Sterilization (Quick Recipe).
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3
MIXED-COLOUR TOMATOES FOR VISUAL DRAMA. The intro mentions yellow + red as a colour-contrast strategy. Yellow tomatoes (Yellow Plum, Lemon Boy) bring sunshine-bright pops; red tomatoes provide the classic preserve colour. The jar looks like edible art with both colours alternating. Yellow tomatoes have slightly less acidity, so they soften slightly faster — use yellow for the jar bottom (longer marinade exposure helps soften red tomatoes more, balancing texture).
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4
THE TRIPLE-USE JAR. Each jar provides three separate preserves for use in cooking: (1) the tomato pieces — direct serving as zakuska or dicing into salads, (2) the soaked onion rings — fantastic salad addition with their absorbed marinade flavour, (3) the spiced marinade liquid — use as vinaigrette base, drizzle on grilled meat, mix into Bloody Mary cocktails. Don't discard any component when you open the jar. For another caviar-style winter preserve worth trying, try Caviar from Green Tomatoes for Winter Without Sterilization.
FAQ
Why "without sterilization" and is it safe? +
"Without sterilisation" means skipping the additional water-bath sterilisation step that fully-sterilised preserves go through. This recipe relies on: pre-sterilised jars and lids, double-pour-with-boiling-water technique (provides heat), salt + vinegar acidic environment (provides chemical preservation), oil floating layer (provides oxygen barrier), inverted-cool slow seal formation (provides vacuum). These layered safety measures combined are sufficient for shelf-stable storage. The result is genuinely safe at room temperature for 12+ months — millions of Russian-Eastern European households make these preserves every autumn.
What tomato varieties work best? +
Dense meaty varieties: Roma (Slivka), San Marzano, Plum, Italian Plum, Yellow Plum. Soft juicy tomatoes (Beefsteak, regular salad tomatoes) collapse during the bake-up and produce mushy preserves. Cherry tomatoes can be used WHOLE (don't slice) for a different presentation. Heirloom varieties with high water content should be avoided. The "Slivka" (Russian for "plum") variety mentioned in the recipe is the gold standard — small dense oval tomatoes with low water content.
How long do the jars keep? +
Properly sealed at room temperature in a dark cupboard, the jars keep 12-18 months. Cool basement extends to 24 months. Once opened, transfer to fridge and use within 2-3 weeks. The tomato texture stays good for 6 months, then softens gradually. The onion rings actually peak around month 3-4 — fully infused with marinade flavour by then. If you spot mould (the oil seal usually prevents this), bulging lid, or fizzing, discard the entire jar.
Can I substitute the dill with other herbs? +
Yes — fresh dill is the Russian classic but variations work. Try: fresh basil (Italian-style, beautiful with tomatoes), fresh tarragon (French-style, more aromatic), fresh thyme (Mediterranean), fresh cilantro (Mexican-Caucasian leaning), or a combination. Dried herbs work but use less (1/3 the volume of fresh equivalents). Avoid: parsley alone (too mild), rosemary (too aggressive), mint (clashes with tomatoes). Fresh dill remains the safest choice for traditional flavour identity.
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