Clean, wash, drain and cut the rhubarb into pieces of about 2 cm. For the dough, mix the fat and sugar with the whisk of the hand mixer until creamy. Add spices. Stir in eggs one by one.
Mix flour, baking powder and oat flakes, stir in. Pour the dough into a greased springform pan (24 cm Ø) sprinkled with breadcrumbs. Mix rhubarb and amaretti and spread on top. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for about 70 minutes.
Cover in between if necessary. Let it cool down afterwards. Warm the jelly and spread it on the cake. Serve sprinkled with hail and icing sugar. Makes about 12 pieces.