Penni: I remember the pie. Oh, Yum. I do not have the old recipe, but the one below is very close to the one I remember.
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FROZEN PISTACHIO PIE

Pistachio pudding and ice cream are
combined in a chocolate crumb crust.
Drizzle warm fudge ice cream topping
over each slice just before serving.
Preparation time:
20 minutes
Baking time:
10 minutes
Cooling time:
15 minutes
Freezing time:
480 minutes

Crust Ingredients:

1 1/2 cups crushed chocolate graham crackers
1/4 cup sugar
1/4 cup LAND O LAKES® Butter, melted

Filling Ingredients:

1/3 cup chopped salted pistachios, reserve 2
tablespoons
1 quart (4 cups) vanilla ice cream, slightly softened
1 (3.4-ounce package instant pistachio-flavored pudding
and pie filling
1 drop green food coloring, if desired

Topping Ingredients:

1/2 cup chocolate fudge topping, warmed

Instructions:

Heat oven to 375º. In medium bowl stir together all crust
ingredients. Press on bottom and up sides of 9-inch pie pan.
Bake for 8 to 10 minutes. Cool 15 minutes.

Meanwhile, in large bowl stir together pistachios, ice cream,
pudding and food coloring. Spoon mixture into cooled crust.
Cover; freeze until firm (8 hours or overnight).

Just before serving, drizzle 1 tablespoon chocolate fudge
topping over each serving; sprinkle with reserved pistachios.

Yield: 8 servings