Add plant / nut milk to a pot and heat on an induction cook top. Induction requires pots and pans that are made of ferrous (meaning magnetic) materials. Check for the induction symbol before proceeding. Open Le Herbe's single serving packet and pour D8 hot chocolate powder (15g) into the heated plant / nut milk. Add dark chocolate (70% +), vanilla extract, and mix with spoon until dark chocolate is melted. Keep heating until you achieve proper consistency. Pour contents of pan into your favorite mug. Add a few marshmallows on top and flame the tops until slightly brown / black with a butane torch. Drizzle or grate some chocolate on top. Allow the D8 hot chocolate to sit for 5 minutes and enjoy.