Melt butter, add 3 egg yolks, 3/4 tbsp. sugar (I take less because I do not like very sweet dough), 1 tsp soda, slaked vinegar. Knead the dough that does not stick to hands. The resulting dough is divided into 2 parts: one to distribute on the bottom of the form, the second to be put in a freezer to well podmesa. To quickly frozen, can this part be divided into smaller clumps.

Now prepare the filling: grate on a coarse grater 4 large apples, pre-clearing them from the skin and core with seeds. Spread the apples on top of the first part of the test, distributed in form. Apples are different, so on count see below was a layer of about 1 cm

Now beat 3 egg whites with a half. a glass of sugar (sugar can be a bit less, if you do not like very sweet taste) and distribute on top of apples.

Now get out of the freezer frozen the dough and on the same grater on top of the three proteins to lay evenly flat layer.

Bake in the oven for Ms. fire (180 degrees) for approximately 50 min. the Time will be different for everyone, because it will depend on the oven. In different ovens I've had different times. Readiness check the match or sobotiste. If the match is dry and crisp - the cake is ready. Bon appetit.

The cake is ready

Here is a breakdown

The sectional view