Prepare the Ingredients: Prepare the kamaboko, fresh shiitake mushrooms, and shrimp according to the recipe’s specified portions, keeping one whole shrimp for each serving and cutting the remaining shrimp into halves or thirds.
Prepare the Egg Mixture: Combine the large eggs with the dashi broth, sake, and mirin, mixing until the ingredients are evenly incorporated.
Strain the Custard: Pass the egg mixture through a fine-mesh strainer to create a smoother custard before steaming.
Arrange the Fillings: Divide the kamaboko, shiitake mushrooms, and prepared shrimp among the chawanmushi cups or small heatproof bowls, arranging the whole shrimp so they can be seen attractively in the finished dish.
Fill the Cups: Carefully pour the strained egg mixture over the ingredients in each cup, leaving the fillings distributed throughout the custard.
Steam the Chawanmushi: Place the cups in a steamer and steam gently until the egg custard is set and has developed its characteristic silky, delicate texture. The source gives a 25-minute total time, including 10 minutes of preparation.
Garnish: Finish the steamed chawanmushi with mitsuba (Japanese parsley) if desired, then serve while warm.