Ukrainian Cheesecake - cooking recipe

Ingredients

CRUST
shortbread (prepared from another recipe, I recommend Shortbread Crust)
CHEESECAKE
2 cups cottage cheese
3 large eggs, Separated
1/2 cup sugar, Granulated
1/2 cup sour cream
2 teaspoons cornstarch
1 teaspoon fresh lemon rind, Grated
1/2 cup walnuts, chopped (optional)

Preparation

Preheat the oven to 325 degrees Fahrenheit.
Press the cottage cheese through a sieve and drain.
In a large mixing bowl, beat the egg yolks until light and foamy, then add the sugar slowly, continuing to beat until very light and smooth.
Add the cottage cheese to the egg mixture, blending well, then add the sour cream, cornstarch, lemon rind, and walnuts (if desired).
Stir until all ingredients are well blended and the mixture is smooth.
In another large mixing bowl, beat the egg whites until they form soft peaks, then gently fold them into the batter.
Pour the mixture into the prepared crust and bake for about 1 hour.
Cool to room temperature before serving.