Kransekake (almond Wreath Cake)

Preheat the oven to 200 degrees C (400 degrees F). Combine almonds and confectioner's sugar in a large saucepan. Add the unbeaten egg white and mix to a firm dough. Place the pan over low heat and knead until the dough is so hot that it is almost impossible to handle. Grease the ring pans for a 16-18 ring cake. Spoon the dough into a cookie press or pastry tube with a wide round tip. Press the dough into the rings, pressing the ends together to look as seamless as possible. Bake 12-15 minutes, until dry and firm outside, but still slightly soft inside. Cool slightly, then remove from the pans and cool completely. For the icing, sift the confectioner's sugar and combine with egg white to make a thick icing. Make a small cone of paper and cut off the tip. Pipe on garlands of icing and stack. Decorate with flags, bonbons or candy.