Peel apples and cut into slices.
Beat yogurt, eggs, powdered sugar and butter with a mixer.
Add flour and baking powder, mix.
Grease the bottom and sides of a baking dish with oil.
Transfer the cake to a mold and bake in the oven for 30-40 minutes until cooked.
Finely chop the ginger. For the sauce, put all the ingredients in a saucepan, bring to a boil and cool.