Combine the ingredients
Grab a medium-sized mixing bowl and put salt, pepper and flour in it. You are now required to dredge or spread the seasoned flour with shank steaks.
Heat the olive oil
In a cooking pan, you should heat the olive oil over medium flame. Once the oil gets hot, braise or fry the shank steaks until they become golden brown. Having fried them nicely, you should drain them and put aside.
Fry the crushed garlic
It is now the turn of crushed garlic to be fried. Fry it until it turns brown. You can now put chopped onion and sauté until they get caramelized. You may continue to sauté after adding the chopped carrots and celery.
Add tomato paste and wine
You should now add tomato paste in the mixture and sauté it for another 3 minutes. While stirring constantly, you are required to add wine in the mixture and keep stirring until it gets dry.
Add other ingredients
Put sugar and some more water to the mixture while you are stirring it. Now let it simmer for another couple of minutes. You can now bring the mixture to boil after adding the browned shanks.
Cover the mixture and let it simmer over low flame for about three hours on a slow cooker. Allow it to simmer until it is tender. If you are short on time, you can use a pressure cooker as it will allow you to save some time. However, using the slow cooker is highly recommended if you are looking to enjoy the best taste.
Having taken osso bucco off the cooker, place it in a nice dish and sprinkle some parsley over it before serving.