Melt the butter, cool
Put in fine sugar and mix well
Add 3 eggs and mix well
Sift in 100g flour and mix well, grind the right amount of lemon peel and add
Stir the yeast evenly and ferment for about 30-40 minutes at room temperature (yeast can be added after adding a small amount of warm water)
Wipe the apple into thin slices, put about half of the lemon juice in the apple slices, stir gently, and add to the batter after fermentation.
Put the oil paper in the baking tray and pour it into the baking tray into the oven for 180 minutes for about 45 minutes.
Bake until golden brown. After cooling, cut into small pieces and put it in the refrigerator for 2 hours.