Scoop the feijoa pulp from the fruit and add it to the blender. Tip: Use a spoon to scoop the pulp—avoid the bitter skin.

Add the vanilla ice cream, milk, and fresh mint leaves to the blender.

Blend on high speed until smooth and creamy, about 30 seconds. Tip: For a thicker shake, add more ice cream; for a thinner one, add more milk.

Taste and add honey if desired, then blend again briefly.

Pour into tall glasses, garnish with a mint leaf, and serve immediately.