Set a pot filled with unsalted water on the stove to boil.
While you are waiting for it to boil, thinly slice the green onion, and cut the kamaboko and takuan about a third to half a centimeter thick.
Add the udon to the boiling water, and do not try to separate the noodles from their block shape. This may break the noodles, and they unfurl naturally when they are cooking. Cook the noodles according to the directions on the package. If you are cooking fresh noodles like I was and if there aren’t any directions, or if they aren’t in English, try for about 3 minutes and see. Dried noodles will take a couple minutes longer.
If you are adding an egg, put it in the pot with the noodles about 1 — 3 minutes before the noodles are done. 3 minutes gives you a hard yolk with a slightly tender inside, and 1 minute will give you a much runnier yolk. Also remember not to just plunk the egg in the pot, but be gentle, so that the egg whites stay intact.
While the noodles are boiling, prepare your broth according to the directions on the package. If using a liquid broth, boil the water that you add to it so that your broth is hot when you are ready to use it.
Scoop the egg out and drain the noodles once your cooking time is up, and place the noodles in a serving bowl.
Decorate your udon with the egg, green onion, ika tenkasu and kamaboko. Place the takuan in a small dish on the side.
Carefully pour the hot broth over the noodles and enjoy!