Thaw fish, if frozen. Rinse fish. In a large skillet or fish poacher, combine wine or broth, onion, salt, pepper, and oregano. Bring to boiling; add salmon. Reduce heat and simmer, covered, for 10 to 12 minutes or until fish flakes easily when tested with a fork. Use a slotted spatula to transfer salmon and onion from cooking liquid to a shallow dish. Discard cooking liquid. Cover and refrigerate salmon and onion for 1 hour or until chilled.

Meanwhile, prepare Apple and Dried Cherry Relish. Cut bread loaf into quarters, if using. Slice each quarter horizontally in half (if bread is very thick, hollow top half slightly). Drizzle cut sides lightly with olive oil. Remove salmon from refrigerator. Cut salmon fillet into 4 equal pieces. Place a piece of salmon on bottom of bread. Top with Apple and Cherry Relish. Add top piece of bread. Wrap securely in plastic wrap. Refrigerate up to 4 hours. (If you like, the salmon, relish and bread can be packed separately and assembled just before eating.) Serve with lemon wedges. Makes 4 sandwiches.

In a small bowl combine reserved onion wedges (from poaching liquid); 2/3 cup Granny Smith apple, cored and diced; 1/3 cup snipped dried cherries, dried cranberries or dried blueberries; 1 tablespoon lemon juice; 1 tablespoon honey; 2 tablespoons snipped fresh flat leaf parsley and 2 teaspoons snipped fresh oregano. Makes about 1 1/2 cups.