Lime Jell-O® Waldorf Salad

Ingredients (6)

• + 2 (3 ounce) packages lime-flavored gelatin mix (such as Jell-O®) add to pantry
• ✓ 2 cups boiling water
• + 2 cups cold water add to pantry
• + 4 red apples, chopped add to pantry
• + 4 stalks celery, chopped add to pantry
• + ½ cup chopped walnuts, or to taste add to pantry