First, wash and dry the fruit to remove any pesticides or preservatives.
Next, simply cut it in half, and scoop out the pulp. Avoid scraping the white part of the inside of the skin, which is bitter like the pith of citrus fruit.
Next, you want to remove the seeds. Do this by pressing the pulp through a sieve, which will separate the seeds from the liquidy pulp. You won’t get a ton, but if you are using the juice for baking or another purpose, this is a necessary task.
If you're looking for puree, simply put all the seeds and juice in a blender and puree, straining for the end product. A bit of crunch will be part of the final product — but it’s a whole lot easier than straining out all of the seeds.
Notes
Passion fruit juice shows up a lot in both non-alcoholic and alcoholic drinks. Mix some puree with sparkling water for a refreshing and simple mocktail, or add the puree to fruit smoothies. On the boozy side, you could combine passion fruit pulp with different alcohols for cocktails. Try passion fruit puree or juice with coconut rum, ginger ale, and pineapple juice. Or stir some into vodka with a generous splash of lime juice.