1 watermelon of 3 kg or more if you want to make a larger quantity
Cut the watermelon into pieces
Place in a large pot
Mix in juice
Filter the juice to remove seeds
Wash the pot
Squeeze the pulp to recover as much juice as possible
For the spin, I use 1 vegan milk filter
Pour the juice into the pot
And cook for about 2 hours, over medium heat
Stir occasionally during cooking
then do not stir during the remaining 30 minutes of cooking
Then pour into 1 small sterilized jar (or larger jar, if you made a larger quantity)
A sugar-free honey (except that naturally contained in watermelon)