1 c. butter (room temperature)
1 c. buttermilk
1 tsp. baking soda
2 c. blackberry jam
1 c. sugar
2 c. flour
2 eggs
2 tsp. cinnamon
3 tsp. nutmeg
2 tsp. allspice

Put all ingredients in a mixing bowl and mix well. Pour into greased 9x13 baking pan. Bake at 300 degrees for an hour and until edges begin to pull away from pan. You may want to reduce the amount of spices.