Preheat oven to 400 degrees. Lightly grease an 8x8 baking dish. Mix 2 slices bread cubed, 2 tbsp fresh parsley, ½ tsp old bay, ½ tsp dried mustard, 1/8 tsp blk pepper, 2 tsp lemon juice, 2 dashes tabasco, 2 tbsp butter softened, and ½ c. mayo together in a mixing bowl. Gently stir in the 1 lb fresh crabmeat until well blended. Place the fish fillets on a clean surface, and spoon 1/4 of the crab mixture onto one side (or use our crab cake to stuff your flounder). Starting on the side with the crab mixture, roll up the fillet. Place into prepared dish open side down. Bake until light brown and bubbly, and fish flakes with a fork, about 15 min.