In a large saucepan, combine onion, green pepper, and 1/4 cup water. Bring mixture to boiling, then reduce heat. Cover and simmer for 3 to 5 minutes or until vegetables are tender.
Add undrained tomatoes to onion mixture, along with garlic, rosemary, paprika, and pepper. Stir in 1 1/2 cups water and both packets from rice mix. Bring mixture to boiling. Add frozen shrimp. Return to boiling, then reduce heat. Cover and simmer for 4 to 5 minutes or until rice is tender and shrimp turn pink. To serve, ladle gumbo into individual soup bowls. Pass hot pepper sauce.