Ingredients

• 8 cups cucumber, peeled and finely chopped
• 1 teaspoon salt
• ¼ teaspoon ground black pepper
• ¼ cup chopped fresh chives
• ⅔ cup butter, softened
• 20 slices whole wheat bread, crusts removed
• ⅓ cup mayonnaise
• 2 cups trimmed and coarsely chopped watercress