First, in a large mixing bowl, combine tamari, apple cider vinegar, and peppercorns. Add your bone-in skin-on chicken drumsticks to the marinade. Cover the mixing bowl and let it marinate in the refrigerator for at least 30 minutes.
Turn the Instant Pot onto the “Sauté” function. Next, place the chicken skin side first and let it cook for about 2 minutes on each side, and then remove it from the pot.
Add about 1/4 cup of water to deglaze the bottom of the pan with a wooden spoon. Next, add the onions. Sauté the onions for about 5 minutes, or until they get soft, then add garlic.
Add the chicken back into the pot, along with the marinade sauce, remaining 3/4 cups water, and bay leaves. Set the Instant Pot to “Meat/Stew” on high pressure for 25 minutes.
(Optional) Grab two ladle spoonfuls of the cooked marinade and combine it with 1 to 2 tablespoons of arrowroot powder. After you’ve mixed the arrowroot powder, stir it back into the Instant Pot.