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Preheat oven to 350. Line 24 muffin cups with paper baking cups.
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Beat cake mix, egg whites, water, ⅓ cup concentrate, oil, and a few drops of food coloring in large bowl with electric mixer at medium speed for 2 minutes. Spoon batter evenly into prepared muffin cups.
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Bake for 18 to 22 minutes or until toothpick inserted into centers comes out clean. Cool completely on wire rack before frosting.
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To make frosting, beat sugar, butter, and remaining ¼ cup concentrate in medium bowl with mixer at medium speed. Beat in a few drops food coloring. Frost cupcakes and decorate with lemon candy.