Alaska Salmon Salad Sandwich

15 1/2 ounces canned Alaska salmon
1/3 cup plain nonfat yogurt
1/3 cup chopped green onions
1/3 cup chopped celery
1 tablespoon lemon juice Black pepper, to taste
12 slices bread

Drain and flake salmon. Stir in remaining ingredients except pepper and bread. Season with pepper to taste. Spread salmon mixture on half of bread slices; top with remaining bread. Cut sandwiches into halves or quarters. Makes 6 sandwiches.