Heat 1 tablespoon oil in a stock pot, enameled cast iron pot, or a large skillet over medium-high heat. Add the sausage and sauté for 5-7 minutes, stirring occasionally, until the sausage is lightly browned. Transfer to a clean plate and set aside.
Start cooking your rice. Add the remaining 2 tablespoons oil to the stock pot. Add bell peppers, celery, jalapeño, onion and garlic. Sauté for 6 minutes, stirring occasionally, until the onions are softened.
Add the can of tomato paste, the diced tomatoes, chicken or beef stock, Cajun seasoning, oregano, basil, thyme, cayenne, bay leaf, salt, pepper, Worcestershire sauce, hot sauce and stir to combine. Continue cooking until the mixture reaches a simmer. Then reduce heat to medium-low, cover and simmer for about 25-30 minutes.
Add the shrimp, and stir to combine. Continue to simmer, stirring occasionally, until the shrimp are cooked through and pink. Stir in the sausage, and remove and discard the bay leaf.
Taste test the jambalaya and add more salt, pepper, and additional Cajun seasoning if needed. (I typically add about 2 teaspoons salt and 1/2 teaspoon pepper.) Remove from heat.
Serve over warm rice.