Tomato Basil Jam
Bright, herbal tomato jam — no cinnamon, no smoke. Paste tomatoes cooked down with garlic, finished with basil cut the same morning. Fresh mozzarella, goat cheese, grilled chicken, tomato sandwiches.
Tomato allocation: 6 lbs paste (Roma / San Marzano / Amish Paste) · 4 lbs slicers (Big Beef / Park's Whopper)
Ingredients
- 6 lbs paste tomatoes (Roma, San Marzano, Amish Paste), cored and chopped
- 4 lbs slicing tomatoes (Big Beef, Park's Whopper), cored and chopped
- 5 cups sugar
- 12 cloves garlic, minced
- 1 cup apple cider vinegar (5% acidity)
- ½ cup bottled lemon juice
- ¼ cup white balsamic vinegar (optional, for brightness)
- 4 tsp salt
- 1 tsp black pepper, freshly ground
- ½ tsp red pepper flakes (optional — a whisper, not a heat SKU)
- 2 packed cups green basil, leaves on the stem, tied in a bundle (steeped, then removed)
- 1 packed cup green basil, chiffonade (stirred in at the end)
Method
- Prep 12 half-pint jars, lids, rings. Hold hot in 180°F water. Start canner heating.
- Combine tomatoes, sugar, garlic, vinegar, lemon juice, white balsamic (if using), salt, black pepper and flakes in a heavy pot.
- Bring to a boil, then simmer 2–2.5 hrs uncovered, stirring frequently until thick and jammy.
- Submerge the tied basil bundle for the last 20 min only — perfume without black flecks.
- Remove the bundle, pressing lightly against the pot. Past 20 min it turns grassy and bitter.
- Off heat, stir in the chiffonade and rest 3 min. Basil's volatile oils cook off fast, so it goes in last.
- Ladle into hot jars, ¼" headspace. Wipe rims. Lids fingertip-tight.
- Boiling water bath 15 min. Off heat. Sit 5 min. Remove and cool undisturbed 24 hrs.
Why it works
Basil is the garden's most abundant input — 20 in-ground plants plus two AeroGarden rounds, well past what pesto freezing absorbs — so this converts surplus at almost no marginal cost. Splitting it into a steeped bundle plus a fresh finish gets depth and top-note aroma from one ingredient. It also fills the gap in the tomato line: the other four are spiced, smoky or fiery, and this is the only one that reads fresh and green — the natural companion sale to the Original at the market table.
Notes
- Cut basil the morning of — oil content peaks before the day heats up; afternoon leaves make a flatter jam.
- Green basil only. Purple anthocyanins turn gray-brown in an acidic, long-cooked base — keep it for pesto and vinegars.
- Pre-bolt leaves only. Once plants flower the leaves turn bitter, so this tracks the June–July window before Decatur heat forces the bolt.
- Chiffonade in one pass with a sharp knife; bruised leaves oxidize black in the jar.
- Acid load (1 cup vinegar + ½ cup bottled lemon juice per 10 lbs tomatoes) matches the Original and is what holds pH ≤ 4.6. Never reduce it, and don't add extra basil in its place — herbs are low-acid.
- Use bottled lemon juice, not fresh: bottled is standardized for acidity, fresh varies fruit to fruit.
- ~3 packed cups of basil per batch — about one cut off 2–3 mature plants.