Categories: Cheesecakes 
      Yield: 10 servings 
  
      1 c  Graham Cracker Crumbs             3/4 c  Sugar 
      3 tb Sugar                               1 ts Vanilla 
      3 tb Margarine, Melted                   3 ea Large Eggs 
     24 oz Cream Cheese, Softened              1 oz Square Unsweeted Chocolate * 
  
  *  The 1 oz square of unsweetened Chocolate should be melted. 
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  Combine crumbs, sugar, and margarine; press onto bottom of 9-inch Spring- 
  form cake pan.  Bake at 350 degrees F., 10 minutes. 
  Combine cream cheese, sugar and vanilla, beating at medium speed on 
  electric mixer until well blended.  Add eggs, one at a time, mixing well 
  after each addition.  Blend chocolate into 1 cup batter.  Spoon plain and 
  chocolate batters alternately over crust; cutting through batters with 
  knife several times for the marble effect.  Bake at 450 degrees F., 10 
  minutes.  Reduce oven temperature to 250 degrees F.; continue baking 30 
  additional minutes.  Loosen cake from rim of pan; cool before removing 
  rim of pan.  Chill.