In bowl, whisk together 1 3/4 cups of the flour, baking powder and salt. In large bowl, using fingers, rub sugar with lemon zest; beat in butter until fluffy, about 3 minutes. Beat in eggs, 1 at a time; beat in 2 tbsp of the lemon juice. Stir in flour mixture, alternating with buttermilk, making 3 additions of flour mixture and 2 of buttermilk.