Cut the passion fruits in half and scoop the seeded flesh into a blender. Add the mango, yogurt, orange juice, vanilla, a pinch of salt and 4 ice cubes. Blend until smooth; you'll still be able to see the broken up seeds. Drink right away.
If your passion fruits are a little on the tart side, you can add a little honey or pure maple syrup for sweetness. Keep in mind that both carbohydrate and sugar numbers for the smoothie will change.
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