Mince the peeled fresh ginger.

Add the minced ginger to the bottled sake.

Refrigerate the sake and ginger mixture overnight to infuse.

Fill a martini shaker halfway with ice.

Add 1 cup of ginger-infused sake to the shaker.

Shake the mixture well until thoroughly chilled.

Strain the chilled sake into 4 martini glasses.

Stir 3 tablespoons of chilled ginger ale into each glass.

Repeat steps 4-8 to make 8 drinks in total.

Garnish each glass with a lemon twist on the rim.

Add a small slice of crystallized ginger to each rim.