Step 1: Preheat and PreparePreheat your oven to 350°F (175°C). While it's warming up, lightly grease and flour your baking pan. For best results, use a light-colored metal pan rather than glass or dark metal, as these can affect baking time and temperature. A 9x13 rectangular pan works wonderfully for sheet cake, or two 8-inch round pans for a layered creation.Step 2: Mix the BatterIn a large mixing bowl, combine the lemon cake mix, eggs, oil, and water. Using an electric mixer, beat on low speed for 30 seconds to combine ingredients without creating air bubbles. Then increase to medium speed and beat for 2 minutes until the batter is smooth and slightly thickened.Pro Tip: For extra fluffiness, separate your eggs and beat the whites to soft peaks before folding them into the batter.Step 3: Add Fresh Lemon FlavorGently fold in the fresh lemon zest and lemon juice. The acid in the juice will react with the cake mix to create an even more tender crumb, while the zest provides intense natural flavor. Use a silicone spatula to incorporate these ingredients without deflating the batter.Step 4: Bake the CakePour the batter into your prepared pan(s), spreading evenly with a spatula. Tap the pan gently on the counter a few times to release any air bubbles. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean or with just a few moist crumbs.Step 5: Prepare the Lemon GlazeWhile the cake is baking, whisk together powdered sugar, lemon juice, and zest in a medium bowl until smooth. The glaze should be thick enough to coat the back of a spoon but still pourable. If it's too thick, add more lemon juice a teaspoon at a time; if too thin, add more powdered sugar.Step 6: Finish and GlazeAllow the cake to cool in the pan for 15 minutes, then transfer to a wire rack if making a layered cake, or leave in the pan for a sheet cake. While the cake is still slightly warm (not hot), pour the glaze over the top, allowing it to drip down the sides for a layered cake or spread evenly across a sheet cake.