Layer Graham Crackers: Start by placing a layer of graham crackers at the bottom of a 9x13 inch baking dish. Make sure to cover the entire bottom.
Mix the Filling: In a medium bowl, combine the lemon filling, whipped cream, lemon zest, and powdered sugar. Mix until smooth and well combined.
Spread the Mixture: Spread a generous layer of the lemon mixture over the graham crackers. Don’t be shy—this is the star of the dish!
Repeat Layers: Add another layer of graham crackers on top of the lemon filling, and then add another layer of the lemon mixture. Repeat this process until you've used all the filling and graham crackers, finishing with lemon mixture on top.
Chill and Serve: Cover the dish and refrigerate for at least 4 hours, or ideally overnight to allow the cake to set properly. When ready to serve, slice and enjoy!