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["Sterilize 2 (1 pint) straight sided wide mouth canning jars, lids and rings by boiling for 10 minutes. Keep the lids and rings in the hot water until needed. Preheat oven to 325 degrees F (165 degrees C)", "In a small bowl, mix flour, sugar, baking soda and cinnamon. Set aside.", "In a medium saucepan, combine butter, water and cocoa powder. Heat and stir until butter is melted and mixture is well blended. Pour into a large bowl.", "Stir in Flour mixture and blend. Add buttermilk, egg and vanilla and beat by hand until smooth. Stir in nuts.", "Distribute evenly into the 2 prepared canning jars. Place the jars on a cookie sheet and bake at 325 degrees F (165 degrees C) for 35 to 40 minutes or until toothpick inserted deep into center of cake comes out clean.", "Using heavy oven mitts, remove cakes from oven one at a time. Place a lid, then a ring onto the jars and screw them down tightly. Place the jars on the counter and listen for them to ""ping"" as they seal. If you miss the ""ping"