Place chicken, breast side up (and giblets if they came with the chicken) in the instant pot.
3.25 pound whole chicken
Add the rest of the ingredients (other than the orzo).
2 medium onions, 5 carrots, 2 stalks celery, 4 cups chicken broth, 1.5 cups water, 2 teaspoons garlic paste, 1 teaspoon basil, 1 teaspoon tarragon, 1 teaspoon parsley, 1 teaspoon salt, 1/4 teaspoon black pepper
Cover the IP and lock it. Make sure the venting knob is set to sealed and press the pressure cooker button. Make sure the settings are in normal mode and high pressure. Set the timer to 27 minutes.
When IP beeps, either do a quick release after 10 minutes (see notes on how to do that) or let it release the pressure naturally but that will take up to 30 minutes.
Open IP and carefully remove the chicken and set aside.
Add orzo, stir and cover the IP again and lock it. Make sure the venting knob is set to the sealed postion and press the pressure cooker button again. Set the timer to 6 minutes. (The IP will not take as long to come to pressure - probably around 5 minutes).
1 cup orzo
Once the IP beeps again, do a quick release after 5 - 10 minutes.
Remove the skin and break the chicken apart in smaller pieces. Please be careful not to burn yourself at this point as the chicken will be hot. You won't need to use all the chicken in the soup; I separate the breast meat and pack it to make chicken salad. There will be enough chicken for the soup.
Return the chicken to the IP and either serve it from there or transfer to a big enough bowl or pan.
Serve, smile, and enjoy.