Brown sausage: Heat 1 tbsp butter in a large Dutch oven over medium; brown sausage 3–4 min. Remove and set aside.
Sauté aromatics: Add remaining butter, then onion, celery, bell pepper; cook 6–8 min until softened. Add garlic 30–45 sec.
Toast almond flour: Sprinkle almond flour over veg, stir and toast 2–3 min.
Add broth: Slowly whisk in chicken broth in two pours, scraping browned bits; bring to gentle simmer.
Tomato & okra: Stir in tomato paste and okra; simmer 6–8 min to thicken.
Finish with protein: Return sausage to pot, add crawfish, heat 2–4 min until warmed. Stir in heavy cream and lemon juice; adjust seasoning.
Cauliflower rice: Sauté cauliflower rice separately 3–4 min until tender; season lightly.
Serve: Spoon cauliflower rice into bowls, ladle etouffée over top, garnish with parsley. Serve immediately.