Combine sugar and butter until creamy. Add the eggs and mix until combined. Mix in the sour cream, milk, lemon extract, and zest. Slowly add dry ingredients until combined. Stir in poppy seeds.
Bake at 350° for 45-50 minutes, or until you can insert a toothpick without any batter sticking to it. Allow the cake to cool for 1 hour before removing from the pan.