Authentic Chawanmushi (Japanese Steamed Egg Custard)

Name: Authentic Chawanmushi (Japanese Steamed Egg Custard)
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Japanese
Ingredients: 2 eggs (approx 120ml); 1/4 tsp salt; 8 slices kamaboko (Japanese fish cake); 2-3 shiitake mushrooms thinly sliced; 100g shrimps 4 whole and the rest cut into halves or thirds; Dashi (three times the egg volume, approx 360ml) + extra for toppings; 1/2 tsp sake; 1 tsp mirin; Mistuba (Japanese parsley) optional garnish