Seedless Raspberry Jam with a Fresh, Uncooked Edge

Three stages

1. Prep — heat 1.35 kg, sieve the seeds, keep 150 g back

   Warm 1.35 kg of the berries in a covered pan for 6 minutes until the juice runs, then push them through a nylon sieve to take out the seeds. Raspberry seeds are small enough to pass a food mill and gritty enough to notice, so the sieve is the only tool that does the job properly.

   Reserve the remaining 150 g of fruit, mashed with a fork, in the fridge. You are going to add it to the pot once the jam is off the heat; it is the reason this jar tastes of fresh raspberries rather than of raspberry jam.

2. Cook — 8 minutes, then stop

   Add the sugar and lemon juice to the seedless pulp and boil hard. Because the pulp has no seeds and no cores, it reaches 104 °C in 8-11 minutes. Time it, and stop at 104 °C even if the plate test is a shade soft — the pectin will finish the job in the jar.

   Sprinkle in the pectin blend, boil exactly 60 seconds, then take the pan off the heat and stir in the reserved raw fruit. That addition drops the temperature to about 88 °C, which is exactly the temperature you want to pot at.

3. Seal — 88 °C fill, water bath, then eat within the year

   Fill 200 ml jars immediately at 88 °C, leaving 6 mm of headspace, and water-bath for 10 minutes. The bath pasteurises the raw fruit you just folded in, so this is still a shelf-stable preserve rather than a fridge jam.

   Judge the set after 48 hours, not after two. Raspberry jam with added pectin firms noticeably on the second day, and a batch judged too soft on day one and reboiled will be rubbery on day three.

Failure diagnosis

Four things go wrong with this preserve more often than anything else. Open the one you are looking at.

• Will not set

  The raw fruit you folded in at the end dilutes the pectin network slightly, so err on the firm side at the pan. If the opened jar weeps within a week, next time boil the base to 105 °C rather than 104 before adding the fresh fruit.

• Graining and crystals

  Medium risk because the sugar ratio is high and raspberry acid is moderate. The lemon juice at the start and the absence of stirring during cooling are both load-bearing; do not skip either.

• Mould or spoilage

  The uncooked fruit added at 88 °C is the only microbiological weak point in the recipe, which is why the water bath is not optional here. A 5-minute bath is not enough for this one — use the full 10.

• Colour loss

  Raspberry red is the second most light-sensitive colour in the collection after strawberry, and it fades to brick within 8 months. Keep jars in a box, not on a shelf, and rotate the oldest to the front.

On the same shelf

Other berries recipes, all already published.