1. In a saucepan, combine water, white sugar, salt, cornstarch and food coloring. Bring to a boil, and cook for about 5 minutes or until thickened. Set aside to cool. Preheat oven to 350 degrees F (175 degrees C.)
2. In a large bowl, combine flour, margarine, confectioners' sugar and vanilla. Mix well and press into a 9 inch pie pan. Prick all over and bake in preheated oven for 8 to 10 minutes, or until lightly browned.
3. When crust is cool, place berries in the shell, and pour the thickened mixture over the top. Chill in refrigerator.
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