Mix the pectin and sugar.
Heat the grapefruit segments (1) and the purées to 45°C in a saucepan.
Add the sugar and pectin mixture, stir and bring to the boil.
Add the gelatine mixture and mix until it has completely dissolved.
Then add the candied grapefruit and the grapefruit segments (2).
Spread the baked cheesecake with 20 g of grapefruit marmalade.