Chocolate Gravy and Bisuits

1 cup sugar
4 1/2 T flour
4 1/2 T cocoa
1 1/2 c water
1 1/2 c milk
1/2 stick butter
3 t vanilla 

Mix sugar, flour, and cocoa together. in a skillet. Slowly add water while whisking Continue to whisk while you add the milk. Heat on medium/high til bubbly. Simmer several minutes to thicken to gravy thickness. Stir continually. After thick add butter and vanilla and serve over or with biscuits.