Soak the poppy seeds in the water in a small bowl for 25-30 minutes.

Preheat oven to 350 degrees. Grease the inside of a bundt cake pan very well and set aside.

In a medium sized bowl, stir together all cake ingredients until moistened. Use an electric mixer and beat batter over medium speed for four minutes.

Pour batter into prepared Bundt cake pan and bake in the preheated oven for 30-35 minutes until a toothpick inserted into cake comes out clean.

Cool completely on a wire rack, then turn pan upside down and gently ease the cake out onto a serving platter or cake stand.

To prepare glaze, whisk the melted butter, powdered sugar, lemon juice, and vanilla extract in a small bowl until smooth. If desired, color half of the icing with yellow food coloring. Drizzle over the top of cake and allow to set before serving.