BONITO BROTH: Add bonito flakes to the water in a pot and bring to a boil. Take off the flame and let steep for 15 minutes. Strain and reserve.
PRESERVED VEGETABLES: To a pot, add shiitakes, daikon, rice wine vinegar, sake, mirin, soy sauce, dashi and sugar and enough water to cover the vegetables. Bring to a boil and let simmer on a low flame until most of the liquid has evaporated. Remove from the flame and allow to cool.
COUSCOUS: Follow the cooking instructions on the package. To add more flavor, you can boil with vegetable stock.
SPICY ROCK SHRIMP: In a hot saute pan, add a little oil, ginger, shallots, garlic and saute quickly, just to brown the garlic. Add rock shrimp, cayenne, sambal and saute for about 1 minute until the rock shrimp is cooked.
PLATING Bring bonito broth back to a boil, add preserved vegetables, cooked couscous and cooked rock shrimp. Garnish plate with scallions, fava beans and hijiki.