Recipe(tried): Ritz Mock Apple Pie (using Ritz crackers)

Someone requested a recipe for Got this from my mom .. its is great

RITZ MOCK APPLE PIE

FOR THE FILLING:
2 cups water
3/4 cup granulated sugar
2 tsp. cream of tartar
30 Ritz Crackers
1 ready-to-use refrigerated pie crust (1/2 of 425-g pkg.) or make your own
1 Tbsp. lemon juice
1 tsp. ground cinnamon
FOR THE TOPPING:
25 Ritz Crackers, crushed (about 1 cup)
1/3 cup packed brown sugar
1/2 tsp. ground cinnamon
1/3 cup non-hydrogenated margarine, melted
2 cups frozen whipped topping

Heat oven to 400 degrees F.

TO PREPARE THE FILLING:
Mix water, granulated sugar and cream of tartar in large saucepan. Bring to boil on medium-high heat. Add crackers; simmer on medium-low heat 5 minutes, stirring occasionally.

Line 9-inch pie plate with crust as directed on package; fill with cracker mixture. Sprinkle with lemon juice and cinnamon.

TO PREPARE THE TOPPING:
Combine all remaining ingredients except whipped topping; sprinkle over Filling.

Bake 15 minutes. Reduce oven temperature to 350 degrees F; bake 20 minutes or until golden brown. Cool. Serve topped with whipped topping.