In a glass, combine cocoa mix with 2 ounces hot water and stir to dissolve.
Add 2 ounces cold water, as well as the syrup, vodka, and whipped topping. Stir until smooth.
Transfer mixture to a shaker filled with ice. Shake and then strain and divide between 2 martini glasses.
Garnish with coconut and chocolate, if using. Enjoy!