Cream a stick of softened unsalted butter with a half cup of light brown sugar, beat until fluffy, and mix well with two eggs and a half cup of sorghum molasses. Mix one and a half cups of flour with a half teaspoon of baking soda, a heaping tablespoon of ground ginger, a teaspoon of cinnamon, and a quarter teaspoon each of ground cloves and allspice. Add two teaspoons pure vanilla extract and a half cup buttermilk. Pour batter into a buttered loaf pan and bake at 350 for about an hour, until the loaf pulls from the edges. Cool before slicing.