Pour 7 ½ ml of fresh lime juice into a mixing glass.
Then, add 75 ml of pineapple juice and a dash of Angostura bitters to the glass.
Pour in 7 ½ ml of Benedictine, 15 ml of cherry brandy, and 7 ½ ml of cointreau or triple sec (whichever one you are using).
Now add 25 ml of gin to the mixing glass and fill it with ice cubes.
Then, pour it all into a cocktail shaker, put the top half of the cocktail shaker on, and shake the mixture vigorously for 20 to 30 seconds.
When you notice a slight frost on the outside of the cocktail shaker and it begins to feel very cold in your hand, your Santa Sling cocktail is mixed.
Tap the outside of the cocktail shaker, to separate the two halves of the cocktail shaker, and strain the drink into a cocktail glass.
Top up the cocktail with crushed ice. Drizzle the drink with grenadine so that it drips down the edges of the glass.
Finally, add a straw, garnish the drink with a slice of pineapple and a glace cherry, and serve chilled.