Heat a heavy cast-iron pot with 1 tablespoon of canola oil and brown breakfast sausage and ground beef until all fat is rendered. Add the onion, celery, bell pepper, and garlic and sauté for 5 minutes. Add 1 cup of water to deglaze the pot and simmer the meat and vegetables covered for an additional 5 minutes. Uncover and continue cooking until all the water evaporates. Add 3 ½ cups of water and 2 teaspoons of salt and bring up to a boil. Add 2 cups of rice, stir and bring back to a boil. Simmer covered for 15 minutes. After 15 minutes, add the parsley and fold rice mixture from bottom to top and put lid back on and simmer for an additional 5 or until rice is tender and liquid has evaporated. Serve hot garnished with green onions.