From Nicole Iizuka, POPSUGAR Food
In a food processor or using an immersion blender, blend together cabbage and water until a red liquid is created. Strain liquid through a mesh strainer into a glass. Add baking soda and stir to turn blue. Add simple syrup and mix to combine.
Fill cocktail shaker with ice and vodka. Cover and shake until chilled.
In a glass, add 1/2 ounce of blue liquid. Top with chilled vodka, peach schnapps, and lemon juice and finish with club soda. Garnish with a lemon peel and serve.