Step 1: Prepare Oven and Pan: Preheat the oven to 350F (175C). Grease and flour a 9x13 inch baking pan. This prevents the cake from sticking, ensuring easy removal and a clean presentation. Alternatively, use baking spray with flour.
Step 2: Combine Dry Ingredients: In a large mixing bowl, combine the yellow cake mix and lemon instant pudding mix. Whisk until there are no lumps. This ensures an even distribution of flavor and a smooth texture.
Step 3: Add Wet Ingredients: Add the vegetable oil, water, eggs, lemon juice, and lemon zest to the dry ingredients. Blend with an electric mixer on low speed until just combined. Increase the speed to medium and beat for 2 minutes until well combined. Ensure all ingredients are fully incorporated for a consistent batter.
Step 4: Bake the Cake: Pour the batter into the prepared baking pan and spread evenly. Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. The top of the cake should be golden brown.
Step 5: Cool the Cake: Remove the cake from the oven and let it cool in the pan for 10 minutes. Then, invert the cake onto a wire rack to cool completely. Cooling allows the cake to set properly and prevents it from becoming soggy.
Step 6: Prepare the Glaze: In a small bowl, whisk together the powdered sugar and lemon juice until smooth. Add more lemon juice, one tablespoon at a time, until desired consistency is reached. The glaze should be pourable but not too thin.
Step 7: Glaze the Cake: Once the cake is completely cooled, drizzle the lemon glaze evenly over the top. Allow the glaze to set for at least 15-20 minutes before serving. This prevents the glaze from running and ensures a beautiful finish.
Optional Tip: For a more intense lemon flavor, poke holes in the warm cake with a fork and pour half of the glaze over it before cooling completely. The glaze will soak into the cake, creating an extra moist and flavorful dessert.