Pour the chicken broth into a saucepan and bring to a simmer over medium heat. Keep warm until you're ready to add it to the risotto.
Heat a Dutch oven over medium heat. (I used my large 5-qt Le Creuset Braiser.) Add the diced andouille sausage and sauté for 4-5 minutes, stirring occasionally, until browned. Use a slotted spoon to remove the sausage from the pot and drain on a paper towel-lined plate; set aside until ready to return to the pot.
Melt two tablespoons of unsalted butter in the pot. Then, add the diced onions, green bell pepper, and celery. Sauté, stirring occasionally, for 2-3 minutes until soft.
Add the Arborio rice and cook for 1-2 minutes, stirring constantly, until the rice kernels begin to turn white.
Then, add the dry sherry and cook, stirring constantly, scraping the bottom of the pan to remove any bits until the liquid is fully absorbed. Next, stir in the drained petite diced tomatoes, cayenne pepper, dried thyme, and Cajun seasoning.
Then, start adding the chicken broth, ½ a cup at a time, stirring until each ½ cup is absorbed before adding the next ½ cup. Reserve the last ½ cup to add at the very end.
After adding all but the last ½ cup of chicken broth, return the andouille to the pot and stir to combine.
Add the peeled and deveined shrimp. Cook, stirring constantly, until the shrimp turns pink, about 4-5 minutes. Take care not to overcook the shrimp or they will become rubbery.
Add the last ½ cup of chicken broth and stir constantly until fully absorbed. Garnish with minced parsley or chopped green onions and serve immediately.
Yield 6 servings