the cake:
01. place the clementines in a pot of water (enough to cover), bring to a boil, and cook for 2 hours (submerged). drain. when cooled, mash/chop/process (juice, pith, peel, and all).
02. preheat oven to 375 degrees F
03. butter a springform pan (8-inch, or 9-inch)
04. in a standard mixer, beat eggs. add sugar, almonds, and baking powder. mix. add in clementine mixture, mix.
05. pour cake mixture into springform, and bake for 40-50 minutes on the middle oven rack. (start checking for doneness at 35 minutes with a skewer/toothpick)
06. remove cake from oven, and let cool on a rack, (cake still in the pan)
07. once completely cooled, remove cake from springform
the candied citrus:
01. slice clementines, lemon, lime, and kumquats thinly (as thin as possible without breaking the shape)
02. bring sugar and water to a boil in a rimmed saucepan. add sliced citrus and let simmer for 20-25 minutes. remove and let cool on parchment paper.
the icing:
01. sift powdered sugar in a large bowl. cut clementines in half, and squeeze juice into bowl like a lemon. start with 1 clementine, and add more until the desired consistency is reached.
02. pour over cake, let harden.
03. add candied citrus over top