Mix the sugar with the pectin.
Blend the lychees very smooth and then bring to a boil along with the purée and glucose.
While this is warm, sprinkle with the pectin-sugar mixture and cook for 2 full minutes.
Add the lemon juice, mix briefly and pour out onto a stainless-steel plate.
Cover with cling film and store in the refrigerator.
Set aside a small amount for the finishing.