Season to taste with red, white, and black pepper, salt, garlic powder; Tabasco sauce.
Melt butter in a 6 quart sauce pot. Saute onions, bell pepper, and celery on medium heat for 5 minutes or until all is thoroughly softened. Add flour, stir in well. Add Half and Half, sour cream, cubed processed cheese, and seasoning.
Cook until all cheese is melted. Add shrimp, crab meat, and mushrooms. Cook on medium heat for 20 minutes, or until shrimp and crab meat is well cooked. Add pimientos for color. Fold cooked rice into seafood sauce. Spoon in serving dish. Garnish accordingly with lemon slices, cut carrot or radish flowers if desired.
Cajun Country -- New Iberia, Louisiana