Heat the pan over medium heat. Add in the salt and heat it up for 1 min. Add in the peppercorn and stir fry until the salt turn lightly brown. Put it aside.
Rinse and pat dry the duck breast. Remove the grains. Coat both side with 1/2 tbsp pepper salt. Marinate it for 6 hours.
Add the aromatic herbs into the pot. Bring it to boil over high heat. Cover and simmer for 2-3 mins
Add in the duck breast (with peppercorns). Bring the mixture to boil again. Cover and simmer for 5 mins
Turn off the heat. Let it sit for about 30-35 mins. Take the duck breast out and cool it down. Slice it and enjoy.