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Green Tomato Jam with Lemon: Refrigerator Recipe
Instructions
Prepare the ingredients and containers. Rinse the tomatoes under running water and dry them. Weigh the ingredients on kitchen scales. Wash glass jars and lids thoroughly with hot soapy water, rinse and dry. These are refrigerator containers, not jars prepared for shelf-stable storage.
Dice the tomatoes. Remove the cores and every damaged spot. Cut the flesh into roughly 1 cm cubes. The skins may stay on: they soften during cooking and help the pieces hold their shape. If the skins are tough, blanch the fruit for 30–45 seconds and peel it.
Combine with sugar and lemon. Put the diced tomatoes in a wide stainless-steel pan. Add the sugar, bottled lemon juice, finely grated zest and salt. Stir, cover and refrigerate for 4–8 hours. The sugar will become wet and the tomatoes will release enough juice, so no water is needed.
Start cooking. Set the pan over medium heat and warm slowly until the sugar is completely dissolved. Bring the syrup to a steady boil, then reduce the heat. Cook for 15 minutes, stirring across the base with a silicone spatula from time to time. Skim off pale foam if necessary.
Reduce to setting point. Continue cooking for 20–30 minutes, stirring more frequently near the end. At sea level, a useful thermometer target is 104°C. Without a thermometer, place a little syrup on a cold saucer: after one minute it should hold its shape and a line pushed through it should not immediately close. The jam thickens further as it cools.
Fill clean jars. Remove the pan from the heat and let vigorous bubbling subside for 2–3 minutes. Carefully spoon the hot jam into dry heatproof jars, leaving 1–2 cm at the top. Do not invert the containers or try to create a vacuum seal: a popped lid is not a substitute for a tested canning process.
Cool and store safely. Leave the jars open on a heatproof surface for about 30 minutes, then cover loosely. When active steam has stopped, close and refrigerate; total time at room temperature should not exceed two hours. Freeze part of the jam in small freezer-safe containers, leaving 2 cm headspace.
Why this recipe is not labelled for pantry storage
Plenty of sugar and lemon juice help flavour and texture, but they do not by themselves prove that a particular formula is safe at room temperature. Shelf-stable home canning depends on researched acidity, product density, jar size and processing time. This recipe therefore takes the conservative route: clean containers, prompt cooling, then refrigeration or freezing.
If you want a research-based sealed-jar preparation using the same vegetable, use our green tomato adjika for canning, which preserves a tested vegetable-to-acid ratio and includes the complete boiling-water process.
How to choose green tomatoes without excessive bitterness
- Size: choose normally formed fruit that has reached the expected size for its variety, rather than tiny immature fruit.
- Stage: mature-green or just-lightening tomatoes with developed seeds and clear gel around them work best.
- Condition: the fruit should be firm, clean and free of disease, mould, decay and frost injury.
- Taste check: if a tiny cooked sample remains sharply bitter, do not use that batch for jam.
How to tell when the jam is ready
| Sign | Expected result |
|---|---|
| Colour | Changes from pale green to translucent amber-olive |
| Pieces | Soft and translucent, while some cubes still hold their shape |
| Syrup | Falls slowly from a spatula and spreads slowly on a chilled saucer |
| Temperature | About 104°C at sea level; at altitude, rely more heavily on the cold-saucer test |
Storage
| Method | Best-quality period | Conditions |
|---|---|---|
| Refrigerator | 10–14 days | At or below 4°C, covered, always use a clean spoon |
| Freezer | About 3 months | Small freezer-safe containers with 2 cm headspace |
| Room temperature | Not recommended | No tested canning process is specified for this formula |
Thaw frozen jam in the refrigerator and do not refreeze it. If you see mould, gas, foam, an unusual smell or a slimy texture, do not taste the product; discard the entire contents.
Nutrition
One 20 g serving contains approximately 50 kcal, less than 1 g protein, 0 g fat and about 12 g carbohydrate. This is an estimate because the result depends on the final yield and how far the syrup is reduced.
How to serve it
Serve green tomato jam on toast, pancakes and cottage-cheese fritters, or spoon it over plain yoghurt. A small amount also pairs well with feta or mature hard cheese. Find more ideas in our homemade jam section.
Recipe video: Green tomato jam with lemon
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 image and step photographs were created with AI and are used as visual illustrations. Follow the stated weights, temperature and setting cues rather than estimating ingredient quantities from the pictures.
FAQ
What does green tomato jam taste like? +
The translucent pieces resemble soft candied fruit, while the flavour is sweet and lemony with a fresh tart edge. Most people do not detect a pronounced tomato flavour.
Do I have to peel green tomatoes for jam? +
No. Mature-green tomato skins soften and help the pieces keep their shape. If the skins are particularly tough, blanch the fruit for 30–45 seconds, chill and peel it.
How can I prevent bitter green tomato jam? +
Use only full-size mature-green fruit, remove every stem and core, and avoid frost-damaged tomatoes. Lemon and sugar balance mild grassy notes, but sharply bitter raw material should be replaced.
Can I reduce the sugar? +
Yes, provided the jam still goes straight into the refrigerator or freezer, but it will set more softly and lose quality sooner. Start with 550–600 g sugar and use the chilled-saucer test.
Why use bottled lemon juice? +
Its acidity is more consistent than that of a random fresh lemon, which makes flavour and setting more repeatable; the zest supplies the aroma. Lemon juice does not, however, turn this into a tested pantry-canning recipe.
Why is my jam still runny? +
Hot syrup always looks thinner. Cool one jar fully for 8–12 hours. If it remains too loose, return the jam to a wide pan and reduce it in short intervals, repeating the cold-saucer test each time.
Can I keep sealed jars outside the refrigerator? +
No. A lid that pops down after hot filling does not demonstrate safety. No tested boiling-water process is specified for this formula, so keep the jam refrigerated or frozen.
How long does green tomato jam keep? +
In a clean covered container at or below 4°C, allow 10–14 days. For longer storage, divide the jam into small portions and freeze it for about three months.
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