Potato Salad
["6 medium potatoes (2 lb.)", "1 1/4 c. mayonnaise", "1 Tbsp. prepared mustard (optional)", "1/2 tsp. salt", "1/4 tsp. pepper", "1 c. thinly sliced celery", "1/2 c. chopped onion", "1/2 c. chopped sweet pickle or relish", "6 hard-cooked eggs, coarsely chopped", "lettuce leaves", "paprika (optional)"]
["Cook potatoes in a covered saucepan in boiling water for 20 to 25 minutes until just tender; drain well.", "Cool slightly.", "Peel and cube potatoes."]
["potatoes", "mayonnaise", "salt", "pepper", "celery", "onion", "sweet pickle", "eggs", "lettuce leaves", "paprika"]