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1
Cook andouille and bacon in large heavy pot over medium-high heat until rendered and edges crisp, 6 minutes; transfer to plate.
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2
Add lard to pot; heat until smoking slightly; whisk in flour slowly, stirring constantly for 8–10 minutes until roux deepens to deep chocolate brown (do not let black specks form—temperature control critical).
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3
Add diced onion, celery, and bell pepper (mirepoix); cook 5 minutes, stirring frequently, until softened.
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4
Stir in minced garlic and tomato paste; cook 2 minutes until fragrant.
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5
Slowly add warm stock while whisking to prevent lumps; add crushed tomatoes, bay leaves, thyme, black pepper, cayenne, and salt; bring to boil, then reduce to low simmer.
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6
Return cooked andouille and bacon to pot; simmer 30 minutes, stirring occasionally.
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7
Add sliced okra; simmer additional 15 minutes until okra tender and sauce thickens slightly.
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8
Remove from heat; stir in file powder if using; taste and adjust seasoning; serve over white rice.