Peel the mangos, remove the flesh, rinse the pepper and remove the stems, (I used the seeds too) the heat lives in the seeds if you don't want too much heat you can remove the seeds or reduce the amount of habanero you want to use, clean up the carrots and chop up. Set aside.
Heat oil in a pan and saute the onion, add garlic and cook for a few minutes. Add the mango, carrot, pepper, apple cider vinegar and bring to a boil then simmer for about 15 minutes or until the mixture is soft.