The vanilla vodka lends the cake-like flavor to the juice. The grenadine sinks to the bottom. It even looks like a pineapple up-side-down cake.
Scale ingredients to servings
1 oz vanilla vodka
2 oz pineapple juice
1 dash grenadine syrup
2 oz pineapple juice
1 dash grenadine syrup
Shake pineapple juice and vanilla vodka with ice in a tumbler. Pour into a martini cocktail glass. Add dash of grenadine, and serve.