Carve peaches crosswise, blanch with boiling water, rinse and peel the skin. Dice the pits and the flesh finely. Wash the lime hot, dab dry, rub off the skin.
Halve the lime and squeeze it.
Weigh 500 g peach pieces, mix with jam sugar and lime juice in a large pot and leave to stand for 3-4 hours.
Bring the peach mixture to the boil over high heat while stirring. Boil for at least 4 minutes while stirring constantly. Stir the lime zest into the finished jam and immediately fill into clean twist-off jars.
Close the jars, place them on the lid for about 5 minutes. Turn them over again and let them cool down.