For crust:
Preheat oven to 350°F. Finely grind
graham crackers in processor. Mix in sugar.
Add butter; mix to blend. Press onto bottom
and up sides of 10-inch-diameter glass pie
dish. Bake until light brown around edges,
about 12 minutes. Cool completely.
For filling:
Whisk first 9 ingredients in
medium bowl. Slightly soften ice cream in
microwave in 10-second intervals. Measure
1 cup ice cream; cover and freeze (reserve
for another use). Spoon remaining ice
cream into large bowl. Working quickly, add
pumpkin mixture and fold just until swirled
into ice cream (do not blend completely). If
ice cream begins to melt, freeze until almost
firm. Spoon ice cream filling into cooled
crust, cover with plastic, and freeze until
firm, at least 6 hours. DO AHEAD: Can be
made 2 days ahead. Keep frozen.
For bark, sauce, and topping:
Line baking sheet with parchment paper;
spray with nonstick spray. Stir chocolate in
bowl set over saucepan of simmering water
until melted and smooth. Pour onto baking
sheet. Using offset spatula, spread chocolate
in even layer into 12x9-inch rectangle.
Sprinkle with nuts. Place in freezer until
hard, at least 30 minutes. Invert onto work
surface. Peel off paper. Coarsely chop. Place
DO AHEAD: Chocolate-almond bark can be
made 2 days ahead. Keep frozen.
Bring brown sugar, corn syrup, 3
tablespoons water, and butter to boil in
heavy medium saucepan, stirring until
butter melts and sugar dissolves. Reduce
heat to medium and boil until dark brown,
stirring occasionally, about 5 minutes.
Carefully stir in 1/2 cup cream, vanilla, and
salt (mixture will bubble vigorously). Boil 1
minute longer. Cool slightly. DO AHEAD:
Sauce can be made 2 days ahead. Cover and
chill. Rewarm before serving.
Using electric mixer, beat 1 1/2 cups
cream and 2 tablespoons sugar in medium
bowl until peaks form. Spoon decoratively
over pie. Sprinkle chocolate-almond bark
over. Cut pie into wedges and serve, passing
warm sauce alongside.