Chopped fruit (such as strawberries, bananas, mango)
Vegan chocolate chips & sprinkles
Vegan marshmallows (soy-free if necessary)
Crumbled vegan cookies (gluten-free if necessary)
Melt the chocolate in a double boiler or a heatproof bowl on top of a pan of boiling water, stirring frequently, until completely smooth. While the chocolate is melting, whisk together the coconut milk, cocoa powder, sugar, coconut oil, arrow-root, and salt in a medium bowl.
Slowly whisk the milk mixture into the melted chocolate and stir until heated through, 1 to 2 minutes. Remove from the heat. If you make this in advance, once it has cooled, you can refrigerate the sauce in an airtight container. It will get very thick, so you will have to reheat it before serving.
Prepare all of the toppings you plan on serving. To assemble, scoop as much ice cream as desired into a bowl, drizzle hot fudge all over it, and top with all the preferred toppings.