Fruity Sicilian Watermelon Gelo (Pudding)

Step 4: Add more stuff

The mixture should have thickened by now, so spoon a small amount of the simmering liquid (about a third of a cup) into a small bowl and mix in the cornstarch. The mixture will turn a pinkish color once it has been incorporated.
Then add the sugar to the mixture and mix well.
Once there are no lumps, pour the mixture into the pot with the purée and stir well.
You may now turn off the heat and mix in the cinnamon and vanilla extract.