Spice Cake Sauce recipe

1 cup brown sugar
2 tablespoons flour
1 1/4 cups boiling water
1 large lump butter
1 ounce brandy, Bourbon or Scotch (optional)

Mix sugar and flour together in pan. Add a little cold water and stir until mixed. Put lump of butter into boiling water and slowly add to the first mixture. Cook, stirring constantly, until thick. Remove from heat and add alcohol if desired. Serve immediately over squares of spice cake.