Instructions
Step 1: Bake the Cake
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Preheat your oven according to the instructions on the white cake mix box.
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Prepare the cake batter as directed and pour it into a 9×13-inch cake pan.
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Bake according to package instructions.
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Once baked, remove from the oven and let the cake cool completely in the pan.
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After cooling, use the handle of a wooden spoon to poke holes evenly across the surface of the cake.
Step 2: Make the Pineapple Mixture
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In a saucepan over medium heat, combine the crushed pineapple (with juice), granulated sugar, and ½ teaspoon vanilla extract.
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Bring to a boil, stirring occasionally, and simmer for 2–3 minutes until slightly thickened.
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Remove from heat and let it cool slightly.
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Pour the warm pineapple mixture evenly over the cooled cake, allowing it to soak into the holes. Spread gently with a spatula to distribute evenly.