In medium bowl, mix together flour, baking powder, and salt.
In large bowl with mixer on medium speed, beat butter and sugar until creamy; add eggs one at a time, beating after each addition; scrape down sides of bowl as necessary (mixture may look curdled that's OK); reduce mixer speed to low; add flour mixture in 3 additions, alternating with milk (begin and end with flour); beat only until blended after each addition; stir in lemon peel.
Scrape batter into prepared pan; level batter by rotating pan briskly.
Bake for 65-70 minutes until toothpick inserted in center comes out clean.
Cool in pan for 5 minutes, then cover with rack and invert; remove pan and leave cake upside down on rack; place over large piece of foil or waxed paper.
Glaze: Mix lemon juice and sugar together; brush all over hot cake (cake will absorb glaze); let cool completely before transferring to cake plate.