Preheat oven to 350º.
Grease botton of 8 or 9 inch square pan.
Sift flour with salt, baking powder, baking soda, cinnamon, ginger and allspice, in mixing bowl.
Combine sortening and boiling water.
Blend in brown sugar, molasses and egg.
Add dry ingredients gradually: mix thoroughly.
Pour batter into pan. Bake at 350º for 30-40 minutes, until gingerbread springs back when lightly touched in center.
While still warm, serve with tangy lemon sauce or sweetened whipped cream.