Preheat the oven to 350°F (175°C). Grease a 9-inch round cake pan and line the bottom with parchment paper.
In a large mixing bowl, whisk together the sifted flour, sugar, and lemon zest until well combined.
1 1/2 cups all-purpose flour
Add the eggs one at a time to the dry mixture, beating with a mixer or whisk until fully incorporated after each addition. Then, stir in the melted butter, lemon juice, vanilla extract, and milk until the batter is smooth and combined.
1 1/2 cups all-purpose flour
Gently fold the fresh raspberries into the batter, trying not to crush them and ensuring even distribution.
1 1/2 cups all-purpose flour
Pour the batter into the prepared cake pan, smoothing the top with a spatula. Bake in the preheated oven for 35-40 minutes or until a toothpick inserted into the center comes out clean and the edges are golden brown.
Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. Once cooled, optionally garnish with additional fresh raspberries and lemon zest before serving.
1 1/2 cups all-purpose flour