Categories: Desserts 
      Yield: 8 servings 
  
      3    Chocolate squares,unsweetene 
  2 1/2 c  Cake flour,sifted 
      2 ts Baking soda 
    1/2 ts Salt 
    1/2 c  Butter,at room temperature 
  2 1/2 c  Brown sugar,firmly packed 
      3    Egg,at room temperature 
  1 1/2 ts Vanilla 
      1 c  Sour cream 
    3/4 c  Water,boiling 
  
  1. Preheat oven to 325'F. 
  2. Melt chocolate on a large square of aluminum foil in a very low oven, 
  bringing up edges of foil to prevent spillage. Cool to room temperature. 
  3. Grease and flour an oblong shallow baking pan, preferably glass, 
  12x8x2". 
  4. Sift flour, baking soda, and salt onto waxed paper and set aside. 
  5. Beat butter in a large bowl until very light and fluffy (easier with an 
  electric mixer). Add brown sugar and beat until very fluffy and no trace of 
  sugary "grittiness" remains. Add eggs and beat until well blended, then 
  stir in melted chocolate and vanilla. Add flour mixture alternately with 
  sour cream, beating after each addition with a wooden spoon. Add boiling 
  water and stir in well. 
  6. At this stage the batter will be thin. Pour at once into prepared pan 
  and bake in preheated oven for 35-40 minutes, or until cake tests done. 
  Turn out onto cake rack and frost with Chocolate-Peanut Butter Frosting 
  (recipe follows) or cut into squares and serve with whipped cream or 
  vanilla ice cream.