egg salad recipe

6 large eggs - 1/4 cup mayonnaise - 1 tablespoon Dijon mustard - 1 teaspoon white vinegar or lemon juice - 1 celery stalk, finely chopped - 2 tablespoons finely chopped red onion - 2 tablespoons chopped fresh parsley or dill - Salt and pepper to taste - Optional: a pinch of paprika for garnish