I have been making this hot cocoa mix for a year or so now.  It is so tasty, and very economical.  I got the original recipe from a magazine - Good Housekeeping, I think.  I have, however, modified it, because I found it didn't need the chocolate the original called for.  Without further ado, here it is.

Hot Cocoa Mix (makes 18 servings)

1 1/2 c your favorite unsweetened cocoa (Hershey's Special Dark, Ghiradelli, Saco)

1 1/4 c sugar

1/4 tsp salt

Mix together well.  Store in a tightly sealed container for up to 6 months (I've actually used it far beyond that). 

Variations: Mocha - add 1/3 c instant coffee granules

Mexican Spice - add 2 tsp cinnamon and 1/4 tsp cayenne

Vanilla - add 1/2 vanilla bean (pod and seeds) that you've pulverized in a food processor

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To make hot cocoa - Mix 3 Tbsp of mix with 1 c milk.  Microwave on high for 1 1/2 - 2 minutes.  You may also make stovetop in the traditional style, simply adding 3 Tbsp mix per cup of milk used.