Steamed Tofu with Minced Chicken and Shrimp in Miso Sauce

I try to re-create an appetizer dish that I eaten at my friend " A " Japanese restaurant in Brooklyn. I don't even know the dish name coz my friend order the tofu dish for me.Basically I know the chef used steamed fish and tofu as the main ingredients. The appetizer tofu is really delicious and pleasant-tasting. The rest of the ingredients I create myself since I can't really ask what they use to make their the tofu appetizer. Ingredients:

1 box Firm Silken Tofu (bean curd)
1 large boneless chicken breast ( approx 1 lb) minced
16 pc medium shrimp (clean and deviened)
(A)
2 tbsp corn starch
1 tsp ground black pepper
1 stalk scallion (clean and cut) plus some for garnishing
1 egg
1 tbsp soy sauce
1 tsp sea salt
For The Sauce:(B)
2 tbsp miso paste
1 tbsp mirin
1 tbsp sugar
1/4 cup water

Method:

1:Chopped boneless chicken until fine,mix with ingredients (A) for 10-15 minutes,set aside.
2:Meanwhile prepare water in steamer at high heat and then cut firm silken tofu into 8 pieces,carefully.
3:Use tablespoon to scoop the chicken mixtures on top of the cut tofu carefully,then top 2 pieces of clean shrimp on top of the chicken mixture. Use a plate or steamer underline with Chinese cabbage to stem the delicate tofu for 15-20 minutes or until cooked.
4:While the tofu cook in the steamer,prepare miso sauce,combine ingredients (B) and cook until rolling boil,then check the seasoning before removed from heat.
5: Remove steamed tofu from steamer onto a plate and pour the hot miso sauce over it. Sprinkle with some cut scallion and serve warm immediately.