To make the sea kelp stock, simmer water and dried sea kelp in a pot over med-low heat for 10 min. Remove the sea kelp and reserved the stock.
To make the sauce, combine all the sauce ingredients in a small mixing bowl and mix well.
To make the stew, put chicken and onion in a large shallow pot (or pan) and add the sauce on top. Pour the reserved stock to just barely cover the chicken, about 2-3 cups; mix everything well. Bring it to boil.
When the stew is starting to boil, add the carrots and onions and stir. Cover with a lid and cook over medium heat for 20 minutes.
Uncover and stir well. Add the fresh chili and cook for another 5 minutes without covering the pot so that the sauce will thicken. Poke a potato and carrot piece with a chopstick of folk. If it goes in softly, the stew is finished. Sprinkle with some chopped green onion and remove the stew from the heat. Serve hot with rice.