Preheat oven to 350 degrees Fahrenheit. Line a 1lb metal loaf pan with parchment paper.
Using a medium-sized bowl, combine sugar, butter, and vanilla. Mix together until combined. Add in eggs. Mix. Add in milk and lemon juice. Mix until combined.
In a medium-sized bowl, whisk together flour, baking powder, baking soda, salt, lemon zest, and poppy seeds.
Spoon the dry ingredients into the wet ingredients. Fold in gently until just combined. Pour batter into the prepared baking pan. Bake for 45-50 minutes or until a toothpick inserted into the center of the bread comes out clean. Let the loaf cool in the pan for 1 hour before glazing.
Glaze
In a medium-sized mixing bowl, combine powdered sugar, poppy seeds, and lemon juice. Whisk until smooth. Pour over completely cooled bread. Slice and enjoy!
Notes
You can grate some additional lemon zest on top of the glaze for additional flavor.
Try not to overmix the batter. You want a light fluffy bread.