1.
Discard any broken shelled or opened (dead) clams. Place remaining clams in large container, and cover with water and 2/3 cup white vinegar. Let stand 30 minutes; drain. Rinse clams in cold water.
2.
Meanwhile, bring a saucepan full of water to boil over medium heat. Boil shrimp in salted water until they turn pink, about 7 minutes. Drain and place shrimp in an ice bath to stop further cooking. Peel and devein.
3.
Meanwhile, in a large pot over medium-high heat, cook the vegetables, liquids and herbs & seasonings (everything but the seafood), stirring occasionally, until onion is tender. The onion tenderness is the measure for cooking time; don't worry about the potatoes. This should take approximately 20 minutes.
4.
Add all seafood into pot with vegetable mixture. Cover and cook over medium heat. As clams open, remove them from their shells and return the meat to the pot. (If a clam doesn't seem to want to open, discard it.)
5.
Continue cooking until all clams have opened and flounder pieces are white through and through, about 20 minutes. Remove bag of Crab & Shrimp Boil Mix and bay leaves.
6.
Serve in bowls. Most important....ENJOY!!!