Chocolate syrup:
Chocolate syrup:
Place sugar, cocoa powder, water, and butter in a small pot. Place the pot on the stove, on medium heat, and bring the mixture to a boil. Simmer the syrup, mixing constantly.
Place sugar, cocoa powder, water, and butter in a small pot. Place the pot on the stove, on medium heat, and bring the mixture to a boil. Simmer the syrup, mixing constantly.
Remove from the stove and let the mixture cool.
Remove from the stove and let the mixture cool.