Wash berries in colander, removing any remaining stems or damaged berries. Place the clean berries on paper towels to drain well.
Sort through to set aside one cup of most beautiful berries (these will be the final topping). Divide remaining fruit into one portion of 2 cups and another one of 3 cups. Refrigerate the 3 cup and the 1 cup portions.
Combine sugar and lemon peel in small bowl, mixing with fork. Mix cornstarch and cinnamon into sugar mixture. Set aside.
Combine 2 cups of berries and 1/4 cup of water in a heavy large saucepan. Cover and bring to a boil. Mix in lemon juice, stirring well, then sugar mixture.
Boil until thickened, stirring constantly to prevent sticking, about 3 minutes. Cover saucepan again and remove from heat. Cool completely, stirring occasionally.
Up to two hours before serving, stir 3 cups of uncooked berries into cooked berry mixture.
Spoon filling into crust, mounding in the center.
Top filing with an even layer of reserved berries. Decoratively place thin strips of lemon peel on top of berry layer.
Refrigerate for 30 minutes to 2 hours.
Optional: top each slice with lightly whipped cream or vanilla ice cream.