Press the "sauté" button on your Instant Pot.
When the "hot" indicator turns on, pour 1 tbsp of oil into the pot, swirling to coat evenly.
Transfer the diced onion, minced garlic, scallions and sliced ginger into the pot and stir for 30 seconds.
Pour chicken stock into the pot.
Add 1 tsp salt, or to taste, and stir until all ingredients are well blended. See Note 2.
Place the leg quarters into the broth, skin side down.
Cancel the "sauté" function, close the lid and pressure cook for 10-15 minutes (time varies depending on size of the leg quarters). Make sure the steam valve is set to sealing position. When time is up, allow the Instant Pot to naturally release all pressure (which will take about 15 minutes).
Prepare an ice bath in a large bowl. Transfer the chicken leg quarters into the ice bath, ensuring that the skin is completely submerged. Soak for about 5 minutes.
While the chicken is soaking, strain all ingredients from the broth by pouring it through a sieve into a separate bowl. Taste the broth and adjust the salt according to taste.
Prepare 2 cups of washed Jasmine rice in your rice pot and drain excess water out extremely well. Pour 2 cups of the broth into the rice pot along with 1 tsp of sesame oil and cook in your rice cooker per manual instructions. See Note 3.
While the rice is cooking, line a dish with paper towel. Remove the chicken leg quarters from the ice bath and transfer them onto the paper towel, skin side down. When they are adequately dried, brush sesame oil onto the skin.
When rice is done, assemble your Hainanese chicken rice and pair with some cucumbers, tomato and cilantro if you want! Don't forget popular sauces such as ginger scallion sauce, chili sauce or sweet soy sauce!