Combine sugar, water, and chopped apples in a pot over medium heat.

Stir until sugar dissolves and the liquid turns clear (about 5-7 minutes).

Remove from heat and stir in the passionfruit pulp.

Let steep for 30 minutes to infuse the flavors.

Strain through a fine-mesh sieve (or cheesecloth for a clearer syrup).

Bottle and refrigerate - lasts up to 2 weeks.