Lemon Chiffon Pie with Cookie Crust

This is a light dessert of soft and silky lemon mousse filling in gingersnap cookie crust. A very nice pie for any occasion--what's great it's simple enough to prepare.
Ingredients: (adapted from epicurious.com, I cut back on the sugar)
1½ cups gingersnap cookie (about 25 cookies, finely ground in food processor)
2 Tbsp. sugar (instead of 2 tbsp.)
5 Tbsp. unsalted melted butter
9-inch glass pie dish (as it heat evenly)
Filling:
2 cups ice cubes
¼ cup water
1 envelope unflavored gelatin
¾ cup sugar (instead of ¾ cup plus 2 tbsp.)
¾ cup freshly sqeezed lemon juice, strained
4 large egg yolks
2 tsp. finely grated lemon peel
a pinch of salt
1¼ cups whipping cream
¼ cup powdered sugar
Method:
1. Preheat oven to 350°F. In a large bowl, mix cookie crumbs, sugar together. Add in the melted butter and stir until mixture is evenly moistened.  Transfer crumb mixture to pie dish and press firmly with fingers the crumb mixture to the bottom and sides of dish. Bake in the center of overn until crust is firm and turn a darker color--about 8 minutes. Remove from oven and cool crust completely (you can make this ahead of time)
2. In medium sized bowl, pour enough water to fill halfway up sides; add in ice cubes. In another small bowl, add ¼ cup of water and sprinkle gelatin over. Let this stand until gelatin softens.
3. Whisk sugar, lemon juices, egg yolks, grated lemon peepl and salt in a saucepan to mix completely over medium low heat. Stir until mixture has thickens slightly or until the mixture coat surface of spoon. The mixture should not curd, when test with thermometer it should registers 160°F. Add gelatin and continue whisking until gelatin dissolves and mixture is smooth and silky. Remove from heat and place saucepan in bowl of ice water, until the filling is cool enough to touch. Continue whisking for another 5-8 minutes.
4. When mixture is cool enough, transfer lemon filling to a large bowl. Beat whipping cream and powder sugar with an electric beater in another bowl. Beat until peaks form and firm. Gently fold in a small portion of the whipped cream into the lemon filling until incorporated. Fold in the remaining cream in three additions.
5. Transfer filling to cooled down crust, moulding the mixture in the center. Keep pie refrigerated until filling is set about 4-5 hour.
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