Canned Tomato Sauce
I used to think canning tomato sauce was this all-day ordeal that required special skills and perfect timing. Then I realized I was overthinking what's essentially just cooking down tomatoes and putting them in jars. Preserving the flavors of summer tomatoes is actually easy and delicious with homemade canned tomato sauce. This versatile sauce becomes the foundation for pasta dishes, pizzas, soups, and more. By making and canning your own tomato sauce, you'll have a pantry staple that's packed with fresh flavors and free from preservatives - plus you'll know exactly what went into every jar.
Is This Project For Me?
If you've got a pile of fresh tomatoes and want to capture that peak summer flavor for winter meals, this is perfect for you. You want a sauce that actually tastes like tomatoes, not like the can, and you're ready to try water bath canning without diving into anything too complicated. This works whether you grew your own tomatoes or bought a basket at the farmer's market. You'll need basic canning equipment, but the process is more straightforward than you'd expect. If you love the idea of opening a jar in January and tasting August sunshine, this belongs on your list. Check out the free printable Food Preservation Quick Guide below.
Get The Guide
Stop second-guessing every step of your food preservation projects. This guide walks you through method selection, safety basics, and how to fix things when they don't go according to plan so you can preserve with confidence instead of crossed fingers.
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Troubleshooting and Safety
Let's talk about what might have you second-guessing your canning skills, because even experienced cooks can feel nervous about food safety. Sauce that's too thin after cooking? I've been there, staring at what looked more like tomato water than sauce. Just keep simmering with the lid off until it reaches the consistency you want. It takes longer than you think, but it's worth the wait.
Jars that don't seal properly usually means the rim wasn't clean or you didn't leave the right headspace. Wipe those jar rims carefully before putting the lids on, and follow your recipe's headspace requirements exactly. If a jar doesn't seal after 24 hours, just pop it in the fridge and use it first.
Sauce separating in the jar with clear liquid on top? That's normal with tomatoes - just stir it back together when you open it. The flavor and safety are still perfect.
If your sauce turned out more orange than red, your tomatoes might not have been quite ripe enough. It'll still taste great, just not quite as vibrant. Next time, let those tomatoes get really red and soft before you start.
Frequently Asked Questions
Do I have to peel the tomatoes
Can I use any type of tomato
Do I need to add lemon juice
Can I add other vegetables
Is water bath canning safe for tomato sauce
How long should jars process
How long will canned tomato sauce last
What if a jar doesn’t seal
Food Preservation Quick Guide
One page for methods, quick ratios, safety basics, altitude tips, and storage. For education only—use tested recipes from reliable sources.
• Water bath canning is for high-acid foods (pH ≤ 4.6) or foods acidified per a tested recipe.
• Low-acid foods (most vegetables, meats, soups) require pressure canning—never water bath.
• Use 5% acidity vinegar for pickling. Keep foods fully submerged. Follow headspace exactly.
• Adjust for altitude. Use jars/lids in good condition. When in doubt—don’t risk it.
Methods at a glance
| Method | Best for | Key rule | Core target / ratio |
|---|---|---|---|
| Freezing | Fruit, veg, stocks, breads | Freeze at 0°F/−18°C. Label & rotate. | Blanch most veg before freezing to lock color/texture. |
| Dehydrating | Fruit, veg, herbs | Dry until leathery or brittle (not tacky). | Store airtight with desiccant; keep cool & dark. |
| Water Bath Canning | Jams, jellies, fruit, pickles, tomatoes (acidified) | Use tested times; keep jars submerged; vent air bubbles. | Typical headspace: jams ¼″; fruit/pickles ½″. |
| Pressure Canning | Low-acid veg, beans, meats, broths | Use correct pressure for altitude; follow tested times. | Headspace usually 1–1¼″ (see recipe). |
| Fermentation | Cabbage, carrots, peppers, etc. | Keep veg fully submerged; use clean tools. | 2–3% brine by weight (see quick ratios). |
| Pickling | Cucumbers, onions, beets, mixed veg | Use 5% vinegar; don’t dilute below tested ratios. | Common hot pack: ≥1:1 vinegar:water + salt/sugar/spices. |
| Jam/Jelly | High-acid fruits | Boil to gel stage; fill hot, process in water bath. | Gel temp ≈ local boiling point + sugar effect (see recipe). |
| Freeze-Drying | Fruits, meals, herbs (with home unit) | Dry until pieces are crisp throughout. | Store in mylar/airtight with O₂ absorber; cool & dark. |
Quick ratios & targets
| What | Basic ratio / target | Notes |
|---|---|---|
| Ferment brine | 2% = 20 g salt per 1000 g water • 3% warm kitchens/crunch | 1 quart water ≈ 946 g → ~19 g salt for 2%. |
| Pickling brine (quick) | ≥ 1:1 5% vinegar : water + 1–3 tbsp salt/qt (per recipe) | Do not reduce vinegar below tested ratios. |
| Jam/jelly sugar | Classic: ~1:1 fruit:sugar by weight (varies with pectin) | Follow pectin brand/recipe; do plate or wrinkle test. |
| Headspace (typical) | Jams ¼″ • Fruits/pickles ½″ • Pressure-canned 1–1¼″ | Always use recipe’s specified headspace. |
| Freezer headspace (liquids) | Leave ½–1″ | Liquids expand; use straight-sided containers or bags. |
Altitude adjustments (quick)
• Water bath canning: add time per the tested recipe. Typical add-ons: +5 min (1,001–3,000 ft), +10 min (3,001–6,000 ft), +15 min (6,001–8,000 ft).
• Pressure canning: increase pressure per the tested recipe. Weighted-gauge cookers are often 10 psi at 0–1,000 ft and 15 psi above; dial-gauge cookers typically start ~11 psi and increase with altitude.
Always follow the specific altitude table in your recipe/manual.
Typical blanch times for freezing (quick)
| Vegetable | Time (minutes) | Notes |
|---|---|---|
| Green beans | 3 | Whole or cut |
| Broccoli florets | 3 | Cool fast; drain well |
| Carrots (slices) | 2 | Spears 3 min |
| Peas | 1½–2 | Shell, blanch, chill |
| Kale/spinach | 2 | Press out water |
| Corn (kernels) | 4 | On the cob 4–7 |
Times vary by cut and maturity; check a tested chart for more vegetables.
Storage guide (best quality)
| Method | Best by | Storage notes |
|---|---|---|
| Water bath canned (high-acid) | 12–18 months | Cool, dark, dry; check seals before use. |
| Pressure canned (low-acid) | 12–18 months | Cool, dark, dry; discard if seal fails or food looks/smells off. |
| Ferments (refrigerated) | Several months | Keep submerged; use clean utensil. |
| Dehydrated | 6–12 months | Airtight with desiccant; cool & dark. |
| Frozen | 8–12 months | 0°F/−18°C; label with date. |
| Freeze-dried | Long-term | Mylar/airtight with O₂ absorber; cool & dark. |
Labeling checklist
- Product & method (e.g., “Dill Pickles – Water Bath”)
- Recipe source & year (tested)
- Date processed • Batch/lot
- Headspace/ratio notes (if helpful)
- Altitude/pressure used (for canning)
Your notes
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