Fluffy Frozen Lemon Squares...sort of

My mom has a really good imagination and a lot of faith in my cooking skills. So when I invite her for dinner and ask what she wants, she feels free to pull something out of her imagination and give me something like "Fluffy Frozen Lemon Squares" Upon further questioning it seems she has a vague memory of some dessert she had once in the early 80's that included Dream Whip and a package of lemon jello. Sure enough, an extensive internet search reveals an abundance of recipes that call for some frozen whipped topping. In case you're an anonymous stranger reading this let me tell you that when I'm reading a recipe and I see something like that in the ingredients list I move on. But mom wants what mom wants and I did ask.

Here's what I came up with;

For the base;
half a package of vanilla cookies crushed to fine crumbs
1/4 cup melted butter
zest of one lemon

Mix together and press into the bottom of a springform pan. Pop it in the freezer while you're putting the rest together.

4 egg whites
1/2 cup of sugar
zest of half a lemon

Beat the egg whites until foamy, then slowly add the sugar and lemon zest and beat until almost stiff peaks form. Set aside while you beat the cream.

1 cup whipping cream
2 Tbsp sugar
zest of half a lemon
juice of 2 lemons

Whip all the ingredients together. With the lemon juice in there the cream won't become as stiff as whipped cream but that's ok. Beat it until it's thick and fluffy.

Fold the cream into the egg whites and pour over the crumbs in the springform pan. Freeze until firm.

Serve with berries.