Peel and halve the pears and remove the core. Finely dice the flesh. Scald peaches with hot water. Rinse cold and peel the skin. Cut peaches in half, stone and dice finely. Weigh 1 kg of flesh, sprinkle with lemon juice and crush coarsely
Slice the vanilla pods lengthwise and scrape out the pulp. Mix fruit sugar and gelling agent (stir sweetener into the fruit mass)
Put the fruit mass in a large pot. Stir in vanilla pulp, pods and gelling agent mixture. Bring to the boil while stirring, then boil for exactly 1 minute until bubbly. Skim off if necessary. Remove the pods. Immediately fill the mixture into clean twist-off glasses and close them. Leave to cool upside down