This recipe calls for making an apple pie "Charlotte" with eggs, flour, sugar, apples, and baking soda. The instructions are to whisk eggs and sugar until light and fluffy. Then mix in flour. Dissolve baking soda in vinegar and stir into the batter along with sliced apples. Pour the batter into a baking form and bake at 180 degrees Celsius for 15-20 minutes. Once baked, remove from the mold and cut before serving.