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Preheat oven to 325 degrees F.
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Spray or grease a jelly roll pan. To make cleanup easy, line with parchment paper.
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Combine cake mix, pecans, shortening, caramel topping (1 cup), and hot water with mixer.
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Spread evenly in the greased jelly roll pan.
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Bake for 30 to 35 minutes.
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Meanwhile, mix powdered sugar, butter, 3 Tablespoons caramel topping and milk in mixer until smooth.
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Once cake has cooled, spread caramel frosting evenly.