Finely dice the onion, green bell pepper, and celery into even 1/4-inch pieces. Mince the garlic. Zest and juice the lemon. Slice the green onions and chop the parsley.
In a Dutch oven over medium heat, melt 2 tablespoons of butter with the olive oil. Add the onion, bell pepper, and celery. Cook, stirring occasionally, for 6 to 8 minutes until softened.
Push vegetables to the sides, add the remaining 1 tablespoon butter and minced garlic. Cook for 30 seconds to 1 minute until fragrant. Add tomato paste and cook for 2 to 3 minutes, stirring constantly, until deepened in color.
Add crushed tomatoes, diced tomatoes with juices, chicken broth, Worcestershire sauce, hot sauce, Creole seasoning, thyme, oregano, smoked paprika, cayenne, and bay leaves. Stir well to combine.
Bring mixture to a boil over medium-high heat, then reduce heat to low for a gentle simmer. Cook uncovered for 25 to 30 minutes, stirring every 5 to 7 minutes.
Remove bay leaves. Stir in lemon zest, lemon juice, sliced green onions, and chopped parsley. Taste and adjust seasoning with salt, pepper, or additional cayenne.