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home-canned vegetable soup

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  • Prep Time: 45 minutes

  • Cook & Simmer Time: 20 minutes

  • Processing Time:

    • Pints: 55 minutes

    • Quarts: 85 minutes

  • Depressurization & Cooling Time: 45–60 minutes in-canner + 12–24 hours room temperature cooling

  • Total Active Time: Approximately 2 hours 15 minutes

  • Yield: Approximately 8 pint jars (500 ml each) or 4 quart jars (1 L each)

Safety Requirements & Rule Checklist

Before beginning, keep these critical safety parameters in mind:

  1. Never use thickeners: Do not add flour, cornstarch, cream, rice, barley, noodles, or pasta before canning. These insulate heat transfer inside the jar and cause under-processing. Add grains or dairy only upon reheating for serving.

  2. Uniform slicing: Cut all vegetables into evenly sized pieces ($1/2\text{-inch}$ to $3/4\text{-inch}$ cubes) to guarantee predictable heat penetration to the jar core.

  3. Clean equipment: Inspect mason jars for chips, hair-line cracks, or defects. Use brand-new, unused two-piece canning flat lids.

Ingredients

Fresh Produce

  • Tomatoes: 6 cups diced, peeled core-free ripe tomatoes (or no-salt-added crushed canned tomatoes)

  • Carrots: 3 cups peeled, sliced into $1/4\text{-inch}$ rounds

  • Potatoes: 3 cups peeled, cubed into $1/2\text{-inch}$ dice (use waxy varieties like Yukon Gold or red potatoes; starchy russets will break down)

  • Green Beans: 2 cups trimmed and snapped into $1\text{-inch}$ lengths

  • Sweet Corn: 1.5 cups whole sweet corn kernels (fresh cut or frozen)

  • Celery: 1.5 cups diced with leaves

  • Yellow Onion: 1.5 cups finely diced

  • Garlic: 3 cloves, finely minced

Broth & Seasonings

  • Vegetable or Chicken Stock: 6 cups low-sodium filtered stock or spring water

  • Olive Oil: 1 tablespoon (keep oil minimal to avoid seal failures)

  • Canning & Pickling Salt: 1 teaspoon per quart jar, or $1/2$ teaspoon per pint jar (optional, for flavor only)

  • Black Pepper: 1 teaspoon freshly ground coarse black pepper

  • Dried Thyme: 1 teaspoon

  • Dried Oregano: 1 teaspoon

  • Bay Leaves: 4 small whole dried leaves (1 leaf per quart or $1/2$ leaf per pint)

Equipment Needed

  • Tested pressure canner with an accurate dial or weighted gauge

  • Mason jars (8 pint jars or 4 quart jars) with clean bands and fresh lids

  • Jar lifter, canning funnel, and magnetic lid wand

  • Non-metallic headspace measuring tool/bubble remover

  • Large 8-quart stainless steel stockpot

  • Clean microfiber towels and white distilled vinegar

Step-by-Step Instructions

Step 1: Preparation & Sanitation

  1. Inspect canning jars carefully for nicks, micro-cracks, or uneven rims. Wash jars, rings, and utensils thoroughly in hot, soapy water and rinse well.

  2. Keep jars hot until filling by placing them in the simmering canner water or a warm oven set to $95^\circ\text{C}$ ($200^\circ\text{F}$) to avoid thermal shock breakage.

  3. Fill your pressure canner with 2 to 3 inches of clean water (roughly 3 quarts) and heat on low so it is hot but not boiling (around $60^\circ\text{C}$ / $140^\circ\text{F}$). Add 2 tablespoons of white vinegar to the canner water to avoid hard-water film on the jars.

Step 2: Prepare the Vegetables

  1. Place a large stainless steel stockpot over medium heat ($175^\circ\text{C}$). Add 1 tablespoon olive oil.

  2. Add diced onions, celery, and minced garlic. Sauté for 3 to 4 minutes until onions are translucent and fragrant. Do not brown.

  3. Add diced tomatoes, carrots, cubed potatoes, cut green beans, and sweet corn.

  4. Pour in the 6 cups of vegetable stock. Stir in black pepper, dried thyme, and dried oregano.

  5. Raise heat to medium-high and bring soup to a rolling boil. Once boiling, immediately reduce heat to medium-low and simmer uncovered for 5 minutes. Vegetables should remain crisp and par-cooked, not mushy.

Step 3: Jar Filling & Headspace Management

  1. Carefully remove one hot jar at a time from warming water using the jar lifter and place on a dry kitchen towel.

  2. Position the canning funnel over the jar mouth.

  3. Ladle a balanced ratio of solids and hot cooking liquid into the jar, leaving exactly 1 inch (2.5 cm) of headspace at the top. Headspace is essential for expansion during pressure canning.

  4. Insert a clean bubble popper tool around the interior perimeter of the jar to release trapped air pockets. Re-measure headspace and adjust liquid if necessary.

  5. If using salt, add $1/2$ teaspoon per pint or 1 teaspoon per quart directly into the top of the jar. Add a small bay leaf piece.

  6. Dip a clean paper towel in distilled white vinegar and wipe the jar rim and threads thoroughly. Any grease, salt grain, or vegetable fragment will cause seal failure.

  7. Center a clean lid onto the rim. Screw the threaded metal band down over the lid until resistance is met, then turn until fingertip-tight. Do not over-tighten with wrist force.

Step 4: Purging the Canner

  1. Using the jar lifter, load jars upright onto the rack inside the pressure canner, leaving slight space between jars for steam circulation.

  2. Fasten the canner lid securely, ensuring the seal or gasket is seated properly.

  3. Turn stove burner to high heat. Leave the vent pipe (petcock) open.

  4. Watch for a steady, continuous column of steam escaping from the vent pipe. Once a forceful plume of steam forms, start a timer and vent the canner for 10 full minutes. This removes trapped air so the canner fills with pure pressurized steam.

Step 5: Pressure Processing

  1. After 10 minutes of uninterrupted venting, place the counterweight or close the petcock to begin building pressure.

  2. Adjust the heat down slightly as the target pressure approaches to stabilize the gauge. Process according to your equipment and elevation:

    • Weighted Gauge Canners:

      • 0 to 1,000 ft elevation: 10 PSI

      • Above 1,000 ft elevation: 15 PSI

    • Dial Gauge Canners:

      • 0 to 2,000 ft elevation: 11 PSI

      • 2,001 to 4,000 ft elevation: 12 PSI

      • 4,001 to 6,000 ft elevation: 13 PSI

      • 6,001 to 8,000 ft elevation: 14 PSI

  3. Once the target pressure is reached, begin timing:

    • Pints: 55 minutes

    • Quarts: 85 minutes

  4. Monitor heat closely. If pressure dips below target PSI at any moment, increase heat to restore target pressure and restart the timer from zero.

Step 6: Safe Depressurization & Curing

  1. When the processing time completes, turn off heat completely. Do not move, bump, or force-cool the canner.

  2. Let the canner cool naturally until the internal pressure returns completely to zero (0 PSI) and the lid lock pin drops. This typically takes 40 to 60 minutes.

  3. Once zero pressure is verified, wait 10 additional minutes before removing the weight or opening the petcock.

  4. Unlock and lift the lid away from your face to allow remaining steam to disperse safely. Wait 10 minutes before handling the jars.

  5. Use the jar lifter to remove jars straight up without tilting. Place them onto a towel-lined surface in a draft-free space, spaced 1 to 2 inches apart.

  6. Leave jars undisturbed for 12 to 24 hours. Do not press down on the lids, retighten bands, or move them while hot.

Quality Testing, Storage & The End of Recipe Protocol

24-Hour Seal Verification

  1. After 12 to 24 hours, check the seal on each jar. The center of the lid should be dished inward and remain rigid when pressed. A sealed jar will emit a clear, high-pitched ring when lightly tapped with a spoon.

  2. If a lid flexes or pops back up, the jar did not seal. Unsealed jars must be stored in the refrigerator and consumed within 3 days, or frozen in freezer-safe containers immediately.

  3. For sealed jars, unscrew and remove the metal screw bands to prevent rusting or hidden seal failure.

  4. Wipe the jar exteriors clean with a damp cloth, dry thoroughly, and clearly label each jar with the contents, batch number, and canning date.

  5. Store in a cool, dark, dry pantry ($10^\circ\text{C}$ to $21^\circ\text{C}$ / $50^\circ\text{F}$ to $70^\circ\text{F}$). For peak flavor and nutrient retention, consume within 12 to 18 months.

Reheating for Serving

Empty contents into a saucepan. Bring to a rolling boil over medium heat and boil vigorously for at least 10 minutes prior to tasting or serving. If desired, stir in cooked egg noodles, wild rice, lentils, or a splash of heavy cream during the final 3 minutes of boiling.

Nutritional Profile

Values calculated per 1 cup (240 ml) serving of prepared soup (base broth and vegetables, excluding optional salt additions):

Metric Amount Per Serving % Daily Value*
Calories 78 kcal —
Total Fat 1.8 g 2%
Saturated Fat 0.3 g 1%
Trans Fat 0.0 g —
Cholesterol 0 mg 0%
Sodium 115 mg 5%
Total Carbohydrates 14.5 g 5%
Dietary Fiber 2.8 g 10%
Total Sugars 4.2 g —
Protein 2.4 g 5%
Vitamin A 210 mcg 23%
Vitamin C 18 mg 20%
Potassium 380 mg 8%
Calcium 34 mg 3%
Iron 1.1 mg 6%

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