Cut the passion fruit in half. Remove the inner pulp and seeds out, and place it in a small saucepan.
Stir in the water and sugar until combined; simmer the mixture, while stirring, until the sugar dissolves.
Pour the syrup mixture through the strainer over a bowl. This will remove the seeds and fine residue from the syrup.
Add the syrup to a glass jar and cover it with a lid. Allow it to cool down before you refrigerate it or it may warm up the fridge. You should be able to keep the syrup for a couple of weeks.