Step 1: Prepare Your Baking Tools

1. Preheat the oven to 350°F (175°C).
2. Grease and flour a 9-inch (23cm) round cake pan or line it with parchment paper.

Step 2: Mix Dry Ingredients

1. In a medium bowl, whisk together flour, baking powder, baking soda, salt, and poppy seeds. Set aside.

Step 3: Cream Butter and Sugar

1. In a large mixing bowl, use an electric mixer to cream the butter and sugar on medium speed until pale and fluffy, about 3 minutes.

Step 4: Add Eggs and Flavorings

1. Beat in the eggs, one at a time, ensuring each is fully incorporated.
2. Stir in vanilla extract, lemon zest, and lemon juice.

Step 5: Combine Wet and Dry Mixtures

1. Gradually add the dry ingredients to the wet mixture, alternating with buttermilk.
2. Begin and end with the dry mixture. Mix gently until just combined.

Step 6: Bake the Cake

1. Pour the batter into the prepared pan, spreading it evenly.
2. Bake for 28-32 minutes or until a toothpick inserted into the center comes out clean.
3. Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack.

Step 7: Make the Glaze

1. In a small bowl, whisk powdered sugar and lemon juice until smooth.
2. Add milk if needed to achieve your desired consistency.

Step 8: Glaze and Decorate

1. Once the cake is completely cool, drizzle the glaze over the top.
2. Garnish with lemon slices, extra poppy seeds, or fresh mint leaves if desired.