In a cocktail shaker glass filled with ice, combine the vodka, Pineapple Reduction, pickling liquid, ginger sake and 4 Pickled Strawberries. Shake, then pour into a collins glass and top with soda. Garnish with 1 sliced Pickled Strawberry and serve.
Combine the liqueur, vinegar, lemon juice and strawberry juice in a medium bowl and whisk to combine. In a glass jar or resealable container, add the strawberries and enough pickling liquid to cover the strawberries completely. Let them pickle in the refrigerator at least 30 minutes or overnight.
In a medium-size saucepan on medium heat, bring the pineapple juice to a boil and then reduce to a simmer and cook until a golden syrup develops. Strain through a fine sieve; cool and transfer to a reusable bottle.