Add the dragon fruit, milk, sweetener, vanilla, and ice to a blender.
Blend for 30–60 seconds until completely smooth.
Add vanilla ice cream if using and blend again briefly.
Taste and adjust sweetness.
Pour into chilled glasses and serve immediately.
✨ Tip: For a thicker, richer milkshake, freeze the dragon-fruit cubes for 1–2 hours before blending and reduce the ice.
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