Wash apples and pears. Remove stalks and flower attachments. Cut the fruits with the core into slices and put them into a large pot. Wash 1 lemon and grate the peel. Squeeze both lemons. Add 1/2 l water, cloves, lemon juice and zest. Bring everything to the boil and simmer covered for about 30 minutes
Line the sieve with a gauze cloth. Place on a bowl. Pour in fruit, let juice drain for 5-6 hours (or overnight). Measure out 1 l
Slice the vanilla pod lengthwise and scrape out the pulp. Mix gelling agent and fructose (stir sweetener into the juice)
Put the juice in a large pot. Stir in vanilla pulp and gelling agent mixture. Bring to the boil while stirring, then boil for exactly 1 minute until bubbly. Skim, immediately fill up to the brim in clean twist-off glasses. Seal and let cool upside down