Preheat oven to 350 degrees Fahrenheit.

Grease a 9x9 inch baking pan.

In a large bowl, mix together the flour, sugar, salt, egg yolks, butter, and lemon rind until well combined. Divide the mixture into two equal parts.

Press half of the dough mixture evenly into the prepared baking pan.

In a separate bowl, combine the applesauce, cinnamon, and cloves. Mix well to combine.

Spread the applesauce mixture evenly over the dough in the pan.

Sprinkle the remaining dough mixture evenly over the applesauce layer.

Bake in the preheated oven for 40-45 minutes, or until golden brown and a toothpick inserted into the center comes out clean.

Let cool slightly before cutting into squares and serving.

Top with whipped cream or lemon sauce, if desired.