Fry the tofu with a lot of oil to make sure it is cooked until inside. Simmer until it is golden brown, and crispy while keeping the inside soft.
You can add the scallions while frying and also on the sauce.
Use hot water, then add pork or chicken broth while dissolving it to hot water. Add fish sauce and scallions.
What are scallions?
Scallions looks like an onion leeks. You should also be eating vegetables.