Pour oil into a pan and on high heat start searing the rabbit. Once one side is getting some golden brown crust sprinkle parsley and half of the salt on top and flip it over.
Once the other side of the meat is getting a golden brown crust stir in the diced onion with the other half of the salt.
Fry the onion under the meat while stirring it until at least it gets a translucent, glassy look. It takes about 5 minutes on high heat. If we are after a bit sweeter flavor then we can cook it longer on low heat until it gets a brownish caramelized look but this takes at least 15 minutes.
Add black pepper, rosemary then pour a cup of water into the pan place a lid on and bring it to boil. Lower the heat and simmer for about 40 minutes.