Step 1: Cook the Meat
In a large skillet or Dutch oven, heat olive oil over medium heat. Add sausage (and beef, if using). Break up the meat with a wooden spoon and cook until browned, about 7–8 minutes. Drain excess fat if needed.
Step 2: Sauté the Vegetables
Add diced onion, bell pepper, celery, and garlic. Cook for 4–5 minutes, stirring often, until softened. This base is the “holy trinity” of Cajun cuisine, just like a French mirepoix—but with bell pepper instead of carrots.
Step 3: Add the Spices
Stir in smoked paprika, Cajun seasoning, thyme, black pepper, and cayenne. Toast for 1 minute to release the oils in the spices.
Step 4: Add the Seafood
Add shrimp and crawfish tails. Cook until the shrimp turn pink and opaque, about 3–4 minutes. Avoid overcooking—shrimp get rubbery fast.
Step 5: Combine with Rice
Lower the heat. Stir in cooked rice and butter. Slowly add chicken stock, a little at a time, until the rice is moist but not soupy.
Step 6: Taste and Adjust
Taste and tweak as needed—maybe more Cajun seasoning, a squeeze of lemon juice, or a splash of hot sauce.
Step 7: Garnish and Serve
Sprinkle with chopped green onions and serve hot.