Prepare veggies by washing and chopping if needed, smash the garlic cloves. No need to peel the carrots, just make sure they are scrubbed clean. Chop veggies into 3-4 inch sections.
Optional Step: heat a frying pan over high heat and add a little oil. Slice onion in half and place onion halves on the pan and char one side for 2-3 minutes until it looks nice and caramelized and a little burned looking. This gives the broth more color and flavor.
Put all ingredients into the Instant pot (at least a six quart).
After placing the lid on securely (make sure the gasket is inserted) set the lid latch to "sealing". Set the instant pot manually to cook on high pressure for 120 minutes, or use the "soup" function which will use the same settings.
Let the instant pot naturally releasefor at least 30 minutes to prevent the rapid bubbling which can cause cloudy broth.Use a slotted spoon to get the largest pieces of bones and veggies out of the pot. Set the mesh strainer in a large bowl and pour the broth through the strainer.
Transfer the broth to freezable containers to store or use right away! Add salt to taste, or wait until you use it in a recipe to have more control of salt content and taste.
Notes
Storage: Refrigerator – 3–5 days with sealed fat cap; 5 days if unbroken. Freezing – jars (leave ½ inch headspace), or cube trays for smaller portions.When reheating, use a gentle simmer on the stovetop to reheat as boiling rapidly for a long time can deteriorate the collagen/gelatin.