1. Color: Look for fruit that is deep purple or yellow, depending on the variety. Avoid dull or green fruit.

2. Wrinkles: A slightly wrinkled skin indicates that the fruit is ripe and sweeter. Smooth skin may mean it's under ripe.

3. Firmness: Gently squeeze the fruit; it should yield slightly to pressure but shouldn’t be too soft.

4. Weight: Choose passion fruit that feels heavy for its size. This indicates juiciness.

5. Aroma: Fresh passion fruit has a sweet, tropical scent. If it lacks aroma, it might not be ripe.

6. Shape: Select round fruit over oval, as round fruit typically has more pulp.

7. Check for Leaks: Avoid any fruit with leaks or obvious signs of over-ripeness; this can indicate spoilage.

8. Storage: If purchased green, allow it to ripen at room temperature, and then store it in the refrigerator.

9. Watch for Mold: Inspect for any signs of mold or dark spots on the skin.

10. Seasonality: Be aware of the season; passion fruit is typically most flavorful when in season.

By keeping these tips in mind, you can ensure you select the best passion fruit available!