Add bay leaf, bring to a simmer and then turn down the heat and cover. You want the ribs to stay at a gentle simmer the entire time. You can place the dutch oven in a 300 degree oven if your stove top is a little hard to monitor. Turn the ribs once per hour and let them cook gently for 3 ½ hours. You will notice that many bones come out of the ribs which is also how you can tell that the ribs are nice and tender.