I've had this little 'recipe' in my files but haven't tried it as yet.
CHOCOLATE ICE MAGIC makes approx ¾ cup
200g bittersweet chocolate, chopped
1 ½ tbsp virgin coconut oil
Melt the chocolate in a small metal bowl set over a pan of simmering water.
Stir in the coconut oil and heat until dissolved, about 1 minute.
Keep the liquid lukewarm until ready to pour over the ice cream. Chocolate will harden into a shell within a few seconds when spooned over ice cream.