How to Can Tomatoes in Glass
Ingredients
Directions
Prepare the tomatoes
Select fresh, ripe, firm tomatoes. Grade them for ripeness, size, and quality.
Blanch the tomatoes by placing them in a wire basket or cheesecloth bag and dipping them into boiling water for one minute or until the skin breaks.
Immediately plunge the tomatoes into cold water. The cold dip makes them easier to handle, separates the skin from the pulp, and coagulates the coloring matter so it stays near the surface, giving them a rich red color. Cut out the core before removing the skin, as there is less danger of breaking the skin.
Pack the jars
Sterilize jars, tops, and rubbers. Pack the tomatoes whole. In quart jars add two level teaspoons of two-thirds sugar and one-third salt.
Strain soft tomatoes, add one cup of juice. Place the jars on rubbers, ensuring they fit up close. If using Mason jars, place the screw top lightly so air may escape when heated. If using Economy jars, put the cover in place and clamp it on. If using E. Z. Seal jars, put the cover in place and leave the spring clamp up.
Process and store
Processing: If you have no canning outfit, place a false bottom in a lard stand or deep kettle. This may be made of poultry netting or laths. Fill the canner with cold water and place the jars, ensuring the water does not come above the neck of the jars. Bring to a boiling point (212°F) and boil hard for thirty minutes. A wire basket or bucket that fits in the boiler will add convenience; large holes should be cut in the bucket so the jars can be lifted out more easily. Throw a bath towel over the jars when lifting them from boiling water. Screw the top on tight at once, press down the clamp of the E. Z. Seal. Place the jars away in a cool, dark place. Do not place them close together or in a warm room, as they will hold the heat and continue cooking. A steam cooker may be used instead of hot water if preferred.
Nutrition, whole recipe (rough)
What these numbers assume: 2 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Sugar | 1 tbsp (12.5g) granulated | 49 |
| Salt | 1 tsp (6g) | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures. See the original page.
Explore the science
What each ingredient does
- Tomatoes (in the method)
- Form the body of the preserve; their pulp and juice soften and hold the pack together.
- Sugar
- Adds sweetness that balances the tomatoes' natural acidity.
- Juice
- Adds liquid around the whole tomatoes, filling the jar and keeping them moist.
The step that matters
Processing in boiling water. The jars must be held at a full boil for the full thirty minutes, with the water not rising above the jar necks. Sustained heat destroys spoilage microbes inside the jar and drives air out so the seal forms properly. Short or weak boiling can leave the contents unsafe to store.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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