"Lime gelatin, red apples, celery, and walnuts make a refreshing and colorful salad...."
INGREDIENTS
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2 (3 ounce) packages lime-flavored gelatin mix (such as Jell-O®)
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2 cups boiling water
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2 cups cold water
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4 red apples, chopped
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4 stalks celery, chopped
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1/2 cup chopped walnuts, or to taste (optional)