Eenytini

Fill a cocktail shaker halfway with ice cubes.

Pour the blue curaçao liqueur, gin, cranberry juice, and 7-Up soda into the shaker in that order.

Secure the shaker lid and shake vigorously for 10-15 seconds until well chilled and combined.

Strain the mixture into a chilled martini glass, pouring carefully to maintain the layered effect if desired.

Serve immediately while cold.