01 -
Fill a cocktail shaker halfway with ice.
02 -
Add white rum (or tequila), lime juice, blue curaçao, and simple syrup (if using).
03 -
Shake for about 10 seconds until the outside of the shaker feels cold.
04 -
Strain into a chilled highball glass packed with fresh ice.
05 -
Top slowly with Baja Blast and give a gentle stir to swirl the colors.
06 -
Garnish with a lime wedge or cherry and serve immediately while fizzy.