Creating the perfect Lemon Lava Cake involves careful preparation and attention to detail. Follow these step-by-step instructions to achieve the perfect blend of gooey center and soft outer cake.

Step 1: Prepare the Oven and Ramekins

1. Preheat your oven to 425°F (220°C).
2. Grease six 6-ounce ramekins with butter and lightly dust with flour to prevent sticking. Place them on a baking sheet.

Step 2: Make the Batter

3. In a medium-sized mixing bowl, combine the melted butter and granulated sugar. Whisk until well combined.
4. Add the eggs and egg yolks, one at a time, whisking until the mixture is smooth and slightly thickened.
5. Stir in the lemon juice, lemon zest, and vanilla extract until fully incorporated.
6. Gradually add the flour and salt to the wet ingredients, stirring gently until the batter is smooth and free of lumps.

Step 3: Fill and Bake

7. Divide the batter evenly among the prepared ramekins, filling each about three-quarters full.
8. Bake in the preheated oven for 12-14 minutes, or until the edges are set but the center is still slightly jiggly. Be careful not to overbake, as this will result in a less gooey center.

Step 4: Serve

9. Allow the cakes to cool for 2-3 minutes. Carefully run a knife around the edges of each ramekin to loosen the cakes.
10. Invert the cakes onto individual serving plates. Dust with powdered sugar and garnish with fresh berries or mint leaves, if desired.