Prepare Black Sesame Ice Cream: Combine heavy cream, milk, and sugar in a saucepan. Heat over medium heat, stirring until sugar dissolves. Remove from heat and stir in black sesame paste and vanilla extract. Chill mixture completely, then churn in an ice cream maker according to manufacturer's instructions.
Prepare Matcha Chocolate Shells: Melt white chocolate and coconut oil in the microwave in 30-second intervals, stirring until smooth. Whisk in matcha powder until fully incorporated. Dip each waffle cone halfway into the melted chocolate, then place on parchment paper to set. Repeat for all cones.
Fill Tacos: Carefully fill each matcha-coated waffle cone with black sesame ice cream.
Add Toppings: Sprinkle with black sesame seeds and garnish with edible gold flakes. Serve immediately.
