Begin by adding fresh pineapple chunks and blueberries into a sturdy cocktail shaker. Pour in 1 ounce of freshly squeezed lime juice and muddle for about 20 seconds.

Next, pour in 2 ounces of reposado tequila and 0.5 ounces of simple syrup or agave, then fill the shaker with ice until it's three-quarters full.

Secure the shaker lid tightly and shake the mixture vigorously for about 15 seconds until chilled.

Use a fine mesh strainer to double strain the mixture into a rocks glass filled with fresh ice.

Garnish with additional fresh blueberries and a slice of pineapple, then serve immediately.