In a large bowl, whisk together jello, sugar, water, and lemon juice until sugar is dissolved. Cover with plastic wrap and refrigerate until almost set (about 1 hour).
Press crushed lemon oreos into the bottom of a 9x13" pan, set aside.
In a medium bowl, pour chilled evaporated milk. Beat until stiff peaks start to form (about 3-5 minutes). Add whipped evaporated milk to the jello mixture, and fold in until completely combined. Pour mixture over oreo crust.
Freeze for 2-3 hours, until set. Cut into squares and serve topped with lemon slices and lemon zest.
Notes
We wouldn’t keep this in the freezer for longer than a week, because it can lose it’s creamy texture and become more icy.Recipe adapted from: Taste of Home