Brown the sausage over medium high heat. Remove with a slotted spoon and very finely dice the sausage. Add the onions, bell pepper, and celery to the pan and saute until just starting to turn tender, about 4-5 minutes. Add the rice, toss to coat, and cook until the rice starts to turn golden and emits a nutty aroma, about 2-3 minutes. Return the sausage to the pan. Add the broth and Cajun seasoning, give a stir, and cover tightly. Bring to a simmer and cook until rice is done, 20-25 minutes. Note: Cajun rubs vary wildly in the amount of heat so if using a rub other than Dizzy Pig Swamp Venom, start with a lesser amount and add more until you get the level that you want. When done, remove from heat and leave covered for 5 minutes. Then add the green onion and parsley while you fluff the rice with a fork. Cover and keep warm until ready to serve.