Prepare the Filling: In a large mixing bowl, combine the sweetened condensed milk and pink lemonade concentrate. Mix well until thoroughly combined.
Incorporate Topping: Gently fold in the thawed whipped topping, making sure to keep the mixture light and airy.
Add Zest (Optional): If you like an extra zing, fold in the lemon zest for a burst of fresh flavor.
Assemble the Pie: Pour the filling into the graham cracker crust, smoothing the top with a spatula.
Chill: Cover the pie with plastic wrap and place it in the refrigerator. Chill for at least 4 hours or until set.
Serve: Once chilled, garnish with lemon slices and fresh raspberries before slicing. Enjoy!