Chocolate Gravy for the Curious

Here's a recipe for the Best Thing Ever:

Chocolate Gravy
2 c milk
3/4 c sugar
2 T cocoa
2 heaping T flour
1/2 t salt
2 T butter
1 t vanilla

Heat milk in a saucepan. While heating, mix together sugar, cocoa, flour and salt; stir in enough milk to make a smooth paste. Next, pour this mixture into the warm milk and stir over moderate heat until thickened. Add butter and vanilla. Serve over biscuits.

It's like brownie batter for breakfast - how can you not love it!

There's an interesting little bit about the possible origins of chocolate gravy at the bottom of this webpage. What I know about chocolate gravy is the following:

• It's yummy.
• My grandmother made it every Christmas and sometimes during the summer when we visited her in Sasakwa, Oklahoma. In later years, my uncle Johnny made the gravy.
  
• There's a diner in Big Flat, Arkansas, that serves chocolate gravy once a year. This "once a year" always falls during the Freeman Family reunion, so everyone goes there for breakfast on that morning. [Note that I've never been to said reunion, but my parents have.] [Other note: Beth Ditto talks about eating chocolate gravy in this interview.]