This sweet-tart jam is a great way to utilize a basket-full of late-summer tomatoes. It does take some time to prepare, but it’s worth it in the end. Keep it on hand to dollop on top of slices of manchego or Comté cheese and whole-grain crackers, drizzle over warm baked Brie, or even add to a vinaigrette. For a special hors d’oeuvre, spoon a bit over a tartlet shell filled with herbed cream cheese, goat cheese, or Boursin. Packaged in a pretty jar with a decorative tag, this addictive condiment would also certainly come as a welcome hostess or holiday gift.
The following canning method relies simply on sterilized jars for vacuum packing, but if you are experienced in sealing your preserves in a boiling water bath, try it. Your jam will last even longer and won’t require refrigeration.
Makes about 6 cups
6 pounds tomatoes, peeled, cored, and roughly chopped
3 cups sugar
1 1/2 cups packed light brown sugar
4 teaspoons salt
1 teaspoon ground cinnamon
1 teaspoon red pepper flakes, or more as desired (optional)
2 tablespoons balsamic vinegar
1 tablespoon vanilla extract
Combine the tomatoes, sugars, salt, cinnamon, red pepper flakes, if using, and 1 tablespoon of the balsamic vinegar in a large (at least 8-quart) saucepan and bring to a simmer over medium heat. Reduce the heat to medium low and cook at a low simmer, stirring occasionally, until the jam is thickened and reduced to about half, about 2 1/4 hours.
Remove from the heat and stir in the remaining 1 tablespoon of balsamic vinegar and the vanilla extract. Fill sterilized jars, seal with lids, and set aside to cool and create a vacuum seal at room temperature for at least 2 hours. Store in the refrigerator for up to 6 weeks.