Peel the apples and cut them into thin short slices about the size of quarters. Crisp sweet apples work best.
Separate the egg whites from the yolks into two cups. Add the sugar to the whites and blend or whip them as foamy as you can. Whip the yolks as well and stir them into the whites. Stir in a tablespoon of oil to the mix. If you're in a rush don't separate the eggs, but the placki won't be as fluffy.
Pour the whipped eggs into a bowl and stir in the flour. Spoon the flour in a bit at a time and stir to get fewer lumps. Work any of the lumps out. A wooden spoon works best. Add flour until the batter is a thick liquid.
Add the sliced apples to the batter. Spread the apple slices out, the batter should cover all the apples. You may have extra apple slices left over depending on the size of your apples.
Heat up a large skillet with 3 tablespoons of oil. Don't just coat the pan, there should be liquid oil in the pan for frying. The oil should be very hot.
Use a small ladle to scoop apples and batter onto the pan. Flatten out the apples in the pan batter so they fry better when you flip them. Each placek ( singular of placki ) should be about the size of an apple. Fry until they turn golden. When brown spots start appearing flip or take them off. These will fry quick, so check them every minute or so.