In a pot, add kombu and water. Heat over medium-low until the water is nearly boiling, about 10 minutes.
Just before it reaches a boil, remove the kombu to avoid a slimy texture and bitterness in the dashi.
Add katsuobushi to the pot and bring the broth to a boil.
Once boiling, reduce the heat and simmer for 30 seconds. Turn off the heat and let the katsuobushi settle at the bottom for about 10 minutes.
Strain the dashi through a sieve into a bowl or measuring cup and set aside.
Oden Broth
Add soy sauce, dark sauce, mirin, sugar, and salt to the dashi. Stir until well combined.
To Prepare the Ingredients:
Peel the daikon and cut it into 1-inch pieces. Trim the edges to prevent breakage during cooking.
In a pot, combine cold water, daikon, a handful of rice (about ¼ cup), and 1 teaspoon of salt. Boil until a skewer easily goes through the daikon to remove bitterness. Remove the daikon and reserve the water.
Cut konjac blocks into smaller triangular pieces. Add to the reserved water and bring to a boil. Remove the konjac and set aside.
Optionally, cut larger fish cakes in half. Add chikuwa, fish cakes, and fish cake sheets to the water. Boil for 1 minute to remove excess oil. Remove and discard the water.
Wash the mushrooms and set aside.
To Assemble the Oden:
Use a shallow pot or large saucepan with depth and a lid. Arrange all the prepared ingredients in the pot. Pour the prepared dashi over the ingredients and bring to a boil. Reduce the heat to low and simmer for 30-45 minutes. For deeper flavor, allow it to soak overnight.
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