Optional Step to Enhance the Bone Broth:
Heat up your pressure cooker over medium high heat (Instant Pot: press Sauté button and click the Adjust button to go to Sauté More function). Make sure your pot is as hot as it can be (Instant Pot: wait until the indicator says HOT).
Add 1 tablespoon (15ml) olive oil in the pot and brown the bones for 3.5 minutes per side. You may have to do it in two batches. Pour in ½ cup (125ml) cold water and completely deglaze the pot by scrubbing all flavorful brown bits with a wooden spoon.