Slice each passion fruit in half crosswise and use a spoon to scoop the pulp and seeds into a bowl. The pulp will be bright orange-yellow and look almost gelatinous around the seeds; that is exactly right. Work over the bowl so you do not lose any juice.
8-10 passion fruits
Add the scooped pulp to a blender along with a cup of water. Blend for 20 to 30 seconds. You are not trying to grind the seeds into powder; you are just loosening the pulp from the seeds so it releases into the liquid. The mixture will look frothy and yellow-orange when it is ready.
3 Cups Water
Pour the blended mixture through a fine mesh strainer set over a large bowl or pitcher. Use the back of a spoon to press the pulp through; you want to extract as much juice as possible. What stays behind in the strainer is seeds and fibrous pulp. Discard that. Do not skip this step or rush it; the seeds have a slightly bitter, tannic quality that will make your juice taste off if they end up in the glass.
Add sugar and the remaining water to the strained juice and stir until the sugar is fully dissolved. Taste it. The juice should be tart-forward with just enough sweetness to balance it. Adjust sugar to your preference here; passion fruit varies in sweetness depending on ripeness, so this step is always a little different.
¼- ½ Cup Sugar
Stir in the fresh lime juice. Transfer to a pitcher or airtight container and refrigerate for at least 1 hour before serving. The chill time lets the flavors come together; the lime especially needs a few minutes to mellow from sharp to bright. Serve over ice.
1 tablespoon lime juice, Ice cubes