• Preheat the oven to 325°F and set an oven rack in the middle position. Spray a 10-inch Bundt pan with non-stick cooking spray and dust with sugar. Be sure the entire pan is coated.
• In a medium bowl, whisk together the flour, baking soda, salt, and poppy seeds. Set aside.
• In a small bowl, combine the buttermilk, lemon zest and lemon juice. Set aside.
• n the bowl of an electric mixer fitted with the paddle attachment (or beaters), cream the butter and sugar on medium speed until light and fluffy, 3-4 minutes. Scrape down the sides of the bowl, then beat in the eggs one at a time, beating well after each addition. Scrape down the sides of the bowl again. With the mixer on low speed, beat in one-quarter of the flour mixture, then one-third of the buttermilk mixture. Beat in another quarter of the flour mixture, then another third of the milk mixture. Repeat with another quarter of the flour mixture and the remaining milk mixture. Finally, beat in the remaining flour mixture. Scrape down the sides and bottom of the bowl, and give a quick mix with a rubber spatula to make sure all of the ingredients are well incorporated.
• Spoon the thick batter into the prepared pan and smooth the top with a rubber spatula. Bake for 65 to 75 minutes, or until the top of the cake is golden and a cake tester comes out clean. Cool the cake in the pan for ten minutes on a rack.

For the Syrup

• While the cake cools, make the syrup. Combine the water and granulated sugar in a saucepan and bring to a boil. Remove from the heat and stir in the lemon juice.
• nvert the warm cake onto the rack. Slip a large piece of parchment paper or aluminum foil under the rack to catch all the drips from the syrup. Gradually brush the hot syrup over the cake, letting it soak in (a little syrup will drip off, but try not to rush so that most of it is absorbed). Allow the cake to cool completely, about one hour. When the cake is cool, carefully transfer it to a serving platter.

For the Glaze

• To make the glaze: stir the confectioners' sugar and lemon juice in a small bowl, mixing until completely smooth. Add more confectioners' sugar if necessary to make a thick, opaque glaze (it should be thicker than you'd think -- you want it the consistency of honey or molasses). Drizzle the glaze over the top of the cake, letting it drip down the sides. Let the glaze harden before slicing and serving the cake, about 15 minutes. The cake will keep nicely for 3 days if kept covered on the countertop.