Cut bell pepper in half lengthwise; discard seeds and membranes.
Place pepper, skin side up, on a foil-lined baking sheet; flatten with hand. Broil 10 minutes or until blackened.
Place bell pepper in a zip-top heavy-duty plastic bag, and seal; let stand 15 minutes. Peel pepper.
Cut bell pepper into julienne strips; set aside.
Bring wine to a boil in a large skillet.
Add clams, mussels, and shrimp; cover, reduce heat, and simmer 5 minutes or until the shells open. Discard any unopened shells.
Remove shellfish with a slotted spoon, and set aside. Reserve 1 tablespoon cooking liquid; discard remaining liquid.
Remove meat from 12 clam and 12 mussel shells; discard shells. Set aside remaining 4 clams and 4 mussels in shells.
Cut peeled shrimp in half lengthwise.
Combine clams, mussels, shrimp, reserved cooking liquid, bell pepper, parsley, and next 8 ingredients (parsley through garlic) in a bowl; toss well. Cover and chill at least 2 hours.
Let stand at room temperature 20 minutes before serving.
Serve with toasted bread slices and remaining clams and mussels in shells.