-CRUST-
 1 1/4 c  All purpose flour
   1/4 c  Powdered sugar
          Pinch of salt
     7 tb Chilled unsalted butter,
          -cut into pieces
     1 tb Cold water
FILLING
     6 tb (3/4 stick) unsalted
          -butter
     4 oz Bittersweet (not
          -unsweetened) or semisweet
          -chocolate, chopped
     2 lg Eggs
   1/4 c  Sugar
     2 tb Light corn syrup
     1 tb Instant espresso powder or
          -instant coffee powder
   1/2 c  Chopped toasted walnuts
          Walnut halves
          Powdered sugar
 FOR CRUST: Blend flour, powdered sugar and pinch of salt in
 processor. Add butter and cut in using on/off turns until mixture
 resembles coarse meal. Add 1 T cold water and blend until dough forms
 moist clumps. Gather dough into ball. Reserve 1/4 C dough for another
 use. Press remaining dough across bottom and up sides of 9
 inch-diameter tart pan with removable bottom. Refrigerate 30 minutes.
 Preheat oven to 350’F. Bake crust until light golden brown, piercing
 with fork if bottom bubbles, about 20 minutes. Transfer to rack and
 cool. (Can be prepared 1 day ahead. Cover and let stand at room
 temperature.)
 FOR FILLING: Preheat oven to 350’F. Stir unsalted butter and chopped
 chocolate in heavy medium saucepan over low heat until melted and
 smooth. Remove from heat. Whisk eggs, 1/4 C sugar, light corn syrup
 and espresso powder in medium bowl. Add chocolate mixture and chopped
 walnuts and stir to blend. Pour filling into crust.
 Bake tart until center of filling is set, about 20 minutes. Transfer
 to rack and cool. (Can be prepared 8 hours ahead. Cover and let stand
 at room temperature.) Remove tart from pan. Garnish with walnut
 halves. Sift powdered sugar over. Cut into wedges and serve.
                 
                 Yields       
                6 servings                
