Add anise seeds and Plum saké to a heatproof vessel. Warm one of two ways: A. In the microwave for approximately 45 seconds, or until thoroughly warmed and infused. B. By placing the vessel into a pot of water on the stove and heating over medium. Water should be at a similar level to the saké. Heat until saké is warm and infused.
Use a fine mesh strainer to strain mixture into a glass.
Stir in the citrus vodka and garnish with a lemon twist.