Preserve · field guide
Savory Tomato Jam
Tomato jam is what to make when you are tired of sauce. It cooks down thick and sticky, sweet with a savory edge, and it turns a plate of crackers or a burger into something people remember. One important note up front: this is a fridge-and-freezer jam, not a canning recipe. There is no tested process for a savory tomato jam, so we do not give you one. Make it, cool it, and store it cold.
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Why this one works
Jam is a great use for soft or ugly tomatoes that would not make a clean sauce. You cook them down hard, so shape does not matter. About 3 pounds of tomatoes reduces to roughly 4 half-pints of thick jam.
The sugar, vinegar, and spice do the flavor work. The long simmer does the rest, driving off water until the jam mounds on a spoon. It takes patience, but the smell alone is worth it.
Pick and prep the tomatoes
Any ripe tomato works: paste, slicing, even cherry tomatoes if that is your glut. Paste tomatoes have less water, so they thicken fastest. Core the tomatoes and chop them; you do not need to peel them for jam because it all breaks down.
Freshness cue: the riper and sweeter the tomato, the better the jam. This is the recipe for the pile that has gone a little too soft to slice.
Why this one is not canned
Do not water-bath can this jam. The National Center for Home Food Preservation publishes exactly one tested tomato jam, and it is a sweet, pectin-set recipe where the large amount of sugar is part of what makes it keep. A savory jam like this one, with onion-and-spice flavor, vinegar, and less sugar, is a different food, and no tested process exists for it from NCHFP, the USDA, or any extension service.
That matters because tomatoes sit right on the edge of the acidity that makes water-bath canning safe. With no tested process, there is no way to tell you a headspace and a time that have actually been proven for this recipe, and guessing at one is how people get hurt. So we do not guess. Keep it cold instead, which is completely safe and takes nothing away from the flavor.
If you want a shelf-stable tomato jam, make NCHFP's Spiced Tomato Jam and follow their process exactly.
How long it keeps
In the fridge, keep it in a clean sealed jar and use it within about 3 weeks. In the freezer, leave 1/2 inch of headspace for expansion and it holds its quality for about a year. Freezing in half-pint jars or small tubs means you thaw only what you need.
One honest caveat: this jam scorches easily near the end when it is thick. Stir often, drop the heat as it reduces, and stay at the stove for the last 15 minutes.
Recipe
Ingredients
- 3 lbs ripe tomatoes, cored and chopped
- 1 1/2 cups sugar
- 1/4 cup 5% cider vinegar
- 1/4 cup bottled lemon juice
- 1 tsp canning or pickling salt
- 1 tsp ground ginger
- 1/2 tsp red pepper flakes
- 1 tsp cumin (optional)
Method
- Combine all ingredients in a wide, heavy pot. Bring to a boil, stirring to dissolve the sugar.
- Lower to a simmer and cook, stirring often, until thick and glossy, about 60 to 75 minutes.
- Test for done: a spoonful mounds and does not run when dropped on a cold plate.
- Cool the jam, then spoon it into clean jars or tubs. Do NOT water-bath can it; there is no tested process for a savory tomato jam.
- Refrigerate and use within about 3 weeks, or freeze with 1/2 inch of headspace for up to a year.
Questions, answered straight
No. There is no tested process for a savory tomato jam from NCHFP, the USDA, or any extension service. The only tested tomato jam is NCHFP's sweet, pectin-set Spiced Tomato Jam, where the sugar is part of what keeps it. Make this one for the fridge or freezer, or make theirs and follow their process exactly.
Drop a spoonful on a cold plate. If it mounds and does not run, it is done. If it spreads out thin, keep simmering and stirring for a few more minutes.
Fridge or freezer. In a clean sealed jar in the fridge it keeps about 3 weeks. To freeze, leave 1/2 inch of headspace so it can expand, and it holds its quality for about a year. Small jars mean you thaw only what you need.
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