Over low heat melt butter thoroughly. Add sugar, milk, and cocoa. (You can also add a little vanilla--1 tsp. or so) Whisking briskly, bring to a boil--you can bring the temperature up to low/medium. Boil for 5 minutes, whisking constantly--it will make sure all the little lumps are removed!!. Remove from stove, then serve warm or cold. (It will thicken even more as it cools.)Keep refrigerated...will last 1-2 weeks. TIP: This recipe is great for doubling, tripling...I've been quintupled it! One batch makes 2 half pint jars.
Keyword easy desserts, hot fudge, hot fudge sauce, ice cream