I spent the Saturday before Christmas making this chocolate sauce for Christmas gifts. After four hours I had 40 half pints! Next year I may try this one from Smitten Kitchen http://smittenkitchen.com/2011/12/peppermint-hot-fudge-sauce/
Kahlua Fudge Sauce
1/2 cup granulated sugar
1/3 cup brown sugar
1 cup cocoa powder
Mix these three ingredients in a sauce pan with a whisk.
Add the following:
1 cup heavy cream
1 cup Kahlua or other coffee liqueur
1/2 cup butter
Heat over lowish heat stirring constantly. Once combined I whisk for a while for a smooth consistency. Bring to a hard boil; boil for 2 minutes.
Remove from heat and add:
3 teaspoons vanilla extract
Fill warm jars with sauce. Canning procedure hasn't been necessary; the jars seal themselves mostly. If not, well, that's just more for you.