Cut the dragonfruit into cubes and mash up the fruit with a muddler.
To a glass, add the dragon fruit concentrate (I bought the concentrate from Trader Joe's, but it's completely optional), ice, and the mashed dragon fruit.
Add one of the rambutans from the can to the drink, and pour in roughly 40ml of the rambutan juice.
Pour in the Yakult and top with milk.
Garnish with more chopped up dragon fruit and a mint leaf.