Preheat oven to 325°F (163°C). Grease and flour bundt pan.
Whisk together flour, baking powder, and salt.
Cream butter and sugar until fluffy (4–5 minutes).
Add eggs one at a time, then vanilla and lemon zest.
Alternate flour and sour cream into butter mixture.
Fold in lemon juice and poppy seeds.
Pour batter into pan, bake 65–75 minutes.
Cool 15 mins in pan, then remove and cool fully.
Whisk glaze ingredients and drizzle over cooled cake.