Cut the apples into small pieces, put them into a bowl, add the flour to stop the apples from browning, and add the melted butter. Add the oil, a pinch of salt, the nuts, and then the chocolate, broken up into small pieces, and the grated lemon rind Mix everything together.Turn the oven on to 150°C so that it is hot when the cake mixture is ready.
Break the eggs into a bowl and whisk. When they are whipped up, add the other ingredients and mix well. Just before putting the cake into the oven, dissolve the yeast in half a glass of milk, add it to the mixture and mix it all together well. Grease a baking dish, pour the mixture into it and cook at 180° C for about 40 minutes.