Bring the pan to the boil and then let them simmer for about forty five minutes, so that they're really nice and soft. (deliciouslyella.com)
Bring the ingredients to a boil over high heat, then let simmer until the sweet potatoes are fork tender, which is about 20 minutes. (iheartnaptime.net)
Bring to a boil, then let simmer on low heat for 3 hours. (parsleyhealth.com)