1 reduced-fat graham cracker crust (9 inches) or chocolate crumb crust (9 inches)
4 large fresh strawberries, halved
Place sliced strawberries in a food processor or blender; cover and process until smooth. Set aside 1-1/2 cups for filling (discard remaining puree or save for another use). In a saucepan, sprinkle gelatin over lemonade concentrate; let stand for 5 minutes. Stir in sugar and reserved strawberry puree. Cook and stir over medium heat until mixture comes to a boil and gelatin is dissolved. Remove from the heat.
Stir a small amount of filling into egg whites; return all to the pan, stirring constantly. Cook and stir over low heat for 3 minutes or until mixture is slightly thickened and a thermometer reaches 160° (do not boil). Remove from the heat; stir in orange juice. Cover and refrigerate for 2 hours, stirring occasionally.
Fold in whipped topping; spoon into crust. Cover and refrigerate for 2 hours or until set. Just before serving, garnish with halved strawberries.
Chocolate crumb crust (9 inches): Combine 1-1/2 cups finely crushed chocolate wafers (about 30 wafers) and 1/3 cup melted butter. Press onto the bottom and up the sides of an ungreased 9-in. pie plate. Bake at 350 until set, 6-8 minutes. Cool on a wire rack before filling.