Preheat oven to 350°F. Spray a 8.5 x 4.5” loaf pan with baking spray and line with parchment, leaving an overhang so the cake can be easily lifted from the pan once baked and cooled.
In a large bowl, whisk together flour, sugar, baking powder, baking soda, salt, and poppy seeds. Add eggs, oil, lemon zest, juice, extract, and buttermilk. Mix well until all dry ingredients are incorporated.
Pour into the prepared pan and bake for 55 to 60 minutes, or until center has set and a wooden pick inserted into the center of the cake comes out clean.
Transfer pan to a wire rack to cool completely.
To make the glaze:
Whisk together all ingredients until smooth. Drizzle over the cooled pound cake and allow glaze to set. Cut cake into slices to serve.