Preheat oven to 350 degrees
Butter a standard size loaf pan
Mix flour, baking powder, and salt together
Cream together softened butter and sugar
Beat in eggs one at a time
Add vanilla extract
Alternate adding flour mixture and lemon juice to the butter mixture
Pour batter into prepared loaf pan
Bake for 1 hour 5 minutes
For glaze: Mix ⅓ cup sugar with ⅓ cup lemon juice
Pour glaze over cooled cake
