Preheat your oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
In a large mixing bowl, cream the softened butter and granulated sugar together using an electric mixer until light and fluffy (about 3-5 minutes).
Add the eggs one at a time, mixing well after each addition. Then, mix in the vanilla extract and lemon zest.
Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk. Begin and end with the flour mixture. Mix until just combined.
Gently fold in the fresh raspberries, being careful not to crush them.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
While the loaf bakes, mix the lemon juice with a tablespoon of granulated sugar to create a simple lemon glaze.
Once baked, allow the loaf to cool in the pan for 10 minutes before transferring it to a wire rack. While still warm, drizzle the lemon glaze over the top.
Allow the loaf to cool completely before dusting with powdered sugar before slicing.
Notes
Serve slices on a decorative plate, garnished with a few fresh raspberries and lemon zest for an elegant touch.