Preheat oven to 350°F (180°C). Spray a 9-inch spherical cake pan with baking spray with flour. Line backside of pan with parchment paper.
In a big bowl, whisk collectively granulated sugar and lemon zest till sugar is aromatic. Whisk in oil, milk, eggs, lemon juice, and vanilla.
In a medium bowl, whisk collectively flour, poppy seeds, baking powder, salt, and baking soda. Regularly add flour combination to sugar combination, whisking till simply mixed. Pour batter into ready pan. Sprinkle glowing sugar evenly on high of batter.
Bake till a picket choose inserted in middle comes out clear and an instant-read thermometer inserted in middle registers 205°F (96°C), 35 to 40 minutes. Let cool in pan for 10 minutes. Take away from pan, and let cool utterly on a wire rack. Simply earlier than serving, garnish with Candied Meyer Lemon Slices, if desired. Retailer in an hermetic container for as much as 3 days.
