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1. Preheat oven to 350 degrees and grease a 9 X 13 pan.
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2. Sift cake mix into a large bowl.
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3. Add eggs, oil, lime juice, lime zest and sour cream. Stir until smooth. (You can add a little green dye if you want to make the cake green!)
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4. Pour into pan, spread out smooth and bake for 25-35 minutes or until an inserted knife comes out clean.
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5. Let cake cool, then poke holes all over the cake using a dowel or the end of a wooden spoon.
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6. Lime Curd: Place sugar, butter lime juice, lime zest and flour in a small sauce pan and heat over medium heat until butter melts. Pour 2 Tbsp. of hot lime mixture into eggs to temper them. Then whisk eggs into lime mixture on stove. Cook until mixture is thickened and coats the back of a wooden spoon. Remove from heat and whisk in sweetened condensed milk then pour over cake.
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7. Let sit 10 minutes, then cover with Cool Whip and crushed graham crackers. Refrigerate until ready to serve!