Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom only of 13x9-inch pan with shortening and lightly flour, or spray with baking spray with flour. In large bowl, beat cake mix, water, oil, eggs, gelatin, 1 tablespoon lime peel and the rum extract with electric mixer on low speed 30 seconds. Beat on medium speed 2 minutes, scraping bowl occasionally. Pour into pan.
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