• Step 1: In a medium bowl, gently mix together the chopped hard-boiled eggs, mayonnaise, celery, Dijon mustard, lemon juice, salt, and black pepper until well combined.
• Step 2: Spread the egg salad mixture evenly onto 4 slices of bread. Top each with another slice of bread to create 4 complete sandwiches.
• Step 3: Serve the egg salad sandwiches immediately, or cover and refrigerate until ready to serve.