Preheat oven to 350 F. Grease an 8x8" pan. Combine flour, sugar and salt. Mix in softened butter. In separate bowl, whisk together eggs,1 T. lemon juice and zest of 1/2 lemon. Add to flour mixture and mix well. Pour into pan and bake for 25 minutes. Remove from oven and cool. Combine powdered sugar, 1 T. lemon juice and zest from other half of lemon. Spread over cooled brownies.