Cream butter, salt, and sugar until light and fluffy. Add eggs one at a time, mixing in between each. In a separate bowl, mix together flour and baking powder. Alternate adding flour mixture (1/3 at a time) and milk to the batter, mixing in between each until well combined. Bake 45- 60 minutes or until a long toothpick comes out clean or with just a few moist crumbs.
For Icing:
In a medium, microwave safe bowl, melt butter. Add powdered sugar and lemon juice and whisk together until no lumps remain.