Remove any excess skin and fat from the chicken. Keep aside.
Massage the chicken (including the cavity) with a generous amount of kosher salt.
Take water in a soup pot. Bring the water to a boil.
Gently add the chicken to the simmering water. The chicken should be completely immersed in the water. You shall notice that scum shall start to float up to the surface. Keep removing with a ladle.
Now add the ginger slices and scallions, continue to simmer over a low flame.
20 mins or so, turn the chicken upside down.
Continue to cook over a low flame till the chicken is tender (another 20 minutes or so). A skewer inserted into the thickest part of the bird should come out clean.
Keep an ice bath ready.
Carefully take the chicken out from the simmering broth and plunge it into the ice bath.
Remove the chicken from the ice bath after 30 minutes or so.
Carve out the breast pieces. Slice as shown in the picture. Drizzle with sesame oil and rub gently. Keep aside.
Strain the broth. Keep aside.