
2 tablespoons mayonnaise
1 tablespoon finely chopped white sweet onion
2 teaspoons Dijon mustard
¼ teaspoon salt
⅛ teaspoon coarsely ground black pepper
4 hard-cooked large eggs*, peeled and chopped
2 tablespoons chopped green bell pepper
¼ cup lightly packed watercress leaves
4 (½-inch) slices Pane Toscano bread
*Note: To hard-cook eggs, in a medium saucepan place 4 large eggs in a single layer. Add enough cold water to cover eggs by 1 inch. Cover and bring to a rolling boil. Remove saucepan from heat; do not drain. Let stand, covered, 15 to 18 minutes. Drain, then immediately place in ice water to cool. Drain again, then peel eggs.