Make the dashi stock by placing all the ingredients into a saucepan and bring to a boil. Stir to combine well. Cool to room temperature, then chill well in the refrigerator until ready to use.
To serve, divide the cold dashi stock into four 1/2 cup servings. Place into four bowls and top with a freshly cracked egg. Divide the sea bream into four servings, and place attractively onto four small plates. Place the garnishes in small bowls on the table. Each person mixes the egg into the stock and adds the sea bream. Let sit to marinate for a few minutes, stirring occasionally. Divide the hot rice into four rice bowls and bring them to the table. Pour the fish/stock mixture over the hot rice, and top with the condiments. Stir lightly and eat.
*Of course you can make your own from scratch as well.