We have two natsumikan trees in the garden, or also called amanatsu. Every year the trees are covered with fruits and usually I would make jam with them and also use the zest since I know they are perfectly safe of chemicals and other nasty products. Usually the fruits are rather sour but this year they are incredibly sweet, as I discovered while making some fluffy cakes with the peel and the juice. For the fluffy cakes I used the recipe of the madeleine but put a little more baking powder and baked them at 180deg until golden. And because the juice of the fruit is really good I did a little frosting using only ice sugar and juice. Perfect for tea or breakfast!