Set the inner pot into the Instant Pot base. Push the saute' button setting. Add the Roasted Sesame oil and wait for three minutes.
Add the chopped tomatoes and let it cook until tender and wilted. Cancel the sautee ' setting.
Pour the water and add the chicken bouillon. Crush the chicken bouillon with a wooden spoon. If you are using powdered bouillon, mix it with the tomatoes.
Cover the Instant Pot with the pressure cooker lid and set the timer to five minutes. Quickly release the pressure when done.
Cancel the pressure cook button setting. Press the sautee' button setting and press start. Set the timer to thirty minutes.
Season the broth with salt, onion, and garlic powder as needed. Slowly pour the egg and gently swirl the broth using a spoon to create egg ribbons.
Mix the cornstarch and water until there are no lumps. Add the cornstarch slurry and gently stir to thicken the soup for about three minutes.
Cancel the sautee button and serve.