the 100-pound yellowish-green jackfruit. “The fruit we eat now is a result of people experimenting extensively for thousands of years,” says archaeobotanist Erica Rowan of Royal Holloway.

Passion fruit should be planted in full sun unless ... When ripe, the fruit changes from deep green to deep purple or yellow. When the fruit is a little bit shrivelled, it is sweetest.

Transfer to a clean bowl and leave to cool slightly before folding in the passion fruit purée ... Add the food colouring paste to make a lime green jelly. Leave to cool until just beginning ...