Place Ice (to taste) in a cocktail shaker.
Shake Pineapple Juice (4 fluid ounce) well and pour over the ice, followed by the St~Germain (4 fluid ounce) and White Rum (4 fluid ounce). Add Fresh Mint Leaves (6), if using. Close the lid and shake vigorously for 30 seconds.
Fill a cocktail glass with 4-6 new ice cubes, pour the mixed drink from the shaker into the glass. Add Ginger Ale (2 fluid ounce) then stir gently.
Garnish with more mint leaves and/or a slice of Pineapple (1 slice). Enjoy!