Stir the softened butter with salt and sugar until fluffy. Stir in the eggs, flour and baking powder.
Peel and halve the apples. Remove the seeds.
Grate 1 apple and stir into the batter.
Pour the batter into a greased pan.
Cut the apples into slices. Put the apples, pieces of butter and chopped nuts on in the dough.
Sprinkle with sugar and decorate the edge with the halved pecans.
Bake for 50 minutes at 180°C (approximately 350°F).
Remove from the oven and let cool slightly. Remove from the pan and cool completely on a wire rack. Cut into pieces and serve.