Peel and core the pineapple (or you can buy a pineapple that’s already peeled and cored).
Slice the pineapple into 7-8 slices. Aim to make each slice about 2/3 inch thick. How many slices you can get will depend on the size of the pineapple.
Roughly chop the dark chocolate (or break it into pieces) then add it to a microwave safe bowl.
Microwave on high heat for 20 seconds, then stir. Repeat until the chocolate is melted, making sure to stir every 20 seconds (how long this will take will depend on the strength of your microwave). Alternatively you can melt the chocolate in a pot on the stove set to low heat or use a double boiler method.
While the chocolate is still warm, immediately add one pineapple ring to the bowl of melted chocolate and use two forks to gently turn it over so that all surfaces are completely coated in chocolate.
Use two forks to lift the chocolate coated pineapple ring and allow any excess chocolate to drip back into the bowl, then place it on a piece of parchment paper on a large plate or platter. Repeat with the rest of the pineapple rings, working as quickly as possible while the chocolate is still warm to ensure the pineapple slices get properly coated.
Sprinkle on any optional toppings while the chocolate is still wet.
Place the plate of chocolate covered pineapple in the fridge for at least 30 minutes to harden before serving.