Mango and Passionfruit Jam: Acid from the Passionfruit, Body from the Mango

Three stages

1. Prep — cut the cheeks, never the fibres

   Cut the two cheeks off each mango and scoop the flesh out with a spoon, then scrape whatever is left on the stone. Do not cut through the fibrous shoulder near the stem: those fibres survive cooking and show up as threads in the finished jam, which is the defect people notice first.

   Mash the mango roughly with a fork and leave it lumpy. Add the passionfruit pulp whole, seeds and all — the seeds are what tell a buyer this is real passionfruit, and they do not soften in the jar, which is exactly the point.

2. Cook — 12 minutes only, mango dies in a long boil

   Combine the mango, passionfruit and lime juice over medium heat for 6 minutes, then add the sugar and stir until dissolved. Mango carries volatile lactones that give it the resinous, floral top note, and they are gone after about 15 minutes of boiling — so everything about this recipe is arranged to be quick.

   Boil hard to 105 °C, which takes another 6-8 minutes, sprinkle in the pectin blend and hold for exactly 60 seconds. Skim, test on a chilled plate, and pot at once. A mango jam that boils for 25 minutes still sets, but it tastes of generic tropical sweetness with none of the fruit left in it.

3. Seal — 10 minutes, and do not tilt the jars

   Pot at 90 °C into 250 ml jars with a 6 mm headspace and process for 10 minutes. The seeds settle to the bottom of the jar within minutes, so fill from the pan with a gentle stir between each jar rather than letting the mix stand — an unstirred pan gives you one jar of seeds and four with none.

   Cool upright and do not tilt a jar to check the seal before it is cold. Mango gel is soft when warm and a tilt will smear the seed layer up the side of the glass permanently.

Failure diagnosis

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

• Will not set

  Mango has effectively no pectin and a pH near 4, so this jam sets on the added pectin and the lime juice alone. If it is loose, check the pH first with a strip; below 3.5 and you need more pectin, above 3.5 and you need more lime.

• Graining and crystals

  Low risk. The sugar ratio is the lowest in the collection at 550 g per kilo of fruit, and the passionfruit acid inverts enough sucrose during the boil that crystallisation is not a practical concern.

• Mould or spoilage

  A 65 Brix jam with a pH of 3.1 does not spoil; if mould appears it is a lid failure. Use new lids, wipe rims, and remember that the passionfruit seeds can lodge in the rim threads — check the rim with your fingertip before capping.

• Colour loss

  Mango carotenoids fade slowly, but the colour settles at a dull orange after about 14 months while the passionfruit aroma goes earlier, at around 10 months. That ten-month mark is when this jam is past its best.

On the same shelf

Other tropical recipes, all already published.