Cut up the roasted chicken into bit-size or easy-to-eat sized pieces.
Pieces left with bone in it will be used for the soup
Leaving the green part of the onions, finely slice the white part.
In a pot, add the 500ml of water, the chicken pieces with bone, the green part of the onions, ginger, and garlic and bring to a boil.
Once boiling, lower the heat and allow it to boil for a while.
In the meantime, let's make some hard boiled eggs.
In a separate pot, add water and the eggs, and bring it to a boil.
Once boiling, turn off the heat, and leave the pot covered.