Add in vegetables (potato, celery, carrot, onion, white part of green onion) and seasonings then bring heat down to let it simmer for 20 mins.
1 potato or daikon, 2 celery stalks, 1 carrot, ½ onion, 3 green onions, 1 tsp salt, 1 tsp black pepper, 1 tsp chicken bouillon powder, 1 Tbsp fish sauce, 1 tsp sugar