The ingredients for this are crazy simple....the only thing you may have to run and get is some unsweetened cocoa powder. I use Hershey's, but you can use some fancier stuff if you have it (i.e. dutch process or whatever). I like Hershey's, it tastes great, is versatile, and you can get a monster thing of it at Sam's. :)
add the cocoa power and salt and whisk to combine....let it boil for about another minute while whisking. (If you let it boil too long it will be more of a sundae sauce consistency and not squeezable out of a bottle).
*WARNING* It. Smells. Amazing.
You can see that the first batch I made only made a small amount. This, clearly, is not enough for me, so I made another batch right away with double the amount.