Muddle the fruits and mint: In a cocktail shaker, add the pineapple chunks, mango chunks, and mint leaves. Using a muddler, gently mash them to release their juices and the aroma from the mint.

Add the whiskey and lime juice: Pour in the whiskey, fresh lime juice, and simple syrup over the muddled fruit.

Shake it up: Fill the shaker with ice cubes and shake vigorously for about 10-15 seconds to mix and chill everything.

Strain and serve: Strain the mixture into a glass filled with fresh ice. If you prefer a more rustic cocktail, you can skip straining and pour it all in.

Garnish: Add a pineapple or mango slice and a sprig of mint for an extra touch of tropical flair.