Line a baking sheet with a piece of parchment paper. Melt the chocolate by placing in a bowl fitted over a pot with simmering water. Be sure the water isn’t a rolling boil, since if the water splatters out, even a tiny drop will make the chocolate seize. So, keep the heat low, and stir the chocolate until it’s smooth. Add remaining ingredients (except salt) and stir through. Transfer the mixture to the parchment paper, using a spatula to scrape out all the chocolate. Tip the baking sheet back and forth to help spread out the chocolate bark to a thin layer (about 1/8"). Sprinkle on salt and any other toppings you’d like. Transfer to fridge until completely cool, about a half our or more. Once fully chilled and hardened, break into pieces for nibbling!