I used to work at a sundae shop. We used to "revive" the hot fudge sauce that had set up, with hot coffee. By Terri
Basic Fudge
Fixing Fudge That Didn't Set
Fudge Came Out Gritty
How Can I Fix Cookie Dough That is Too Gooey?
Problems Making Fudge
How to Fix Grainy Fudge