Turn on the sauté function and add the olive oil. Sauté the ground beef for a few minutes, then add the onion, garlic, carrot, celery and herbs. Add salt and pepper to taste.
Cook for a few minutes. Then place the Instant Pot on the slow cooker. Add the remaining ingredients and simmer for at least 6-8 hours. I left it on for a total of 14 hours because that worked best for me. Longer is no problem! Once cooked, season the sauce with salt and pepper.