In a Dutch oven, heat oil over medium heat; add garlic and lightly brown. Add meat; brown on all sides. Add tomatoes, salt, pepper, cayenne, and paprika. Cover and simmer for 1 hour. Add onions. Cover and simmer for 30 minutes. Add potatoes and celery; cover and cook for 30 minutes longer, or until potatoes are tender. Stir flour and water paste into the broth; heat until thickened. Serves 6.