Over medium heat sauté onion, bell peppers, and celery 2-3 minutes until just beginning to soften. Add flour and stir well, sauteing 2-3 minutes to cook out the flour flavour.
Stir in crushed tomatoes, diced tomatoes with juice, and chicken broth. Simmer on low 20-30 minutes until sauce thickens, and peppers are softened.
Add shrimp, cover and simmer for 5 minutes longer until Shrimp are just cooked through,
Notes
Serve with rice and a green vegetable. We like broccoli or green beans.