Lime Bars

Makes 16 small bars 1 cup all-purpose flour 1/8 teaspoon salt 1/2 cup confectioner's sugar 1 stick (8 tablespoons) butter, melted but not hot 2 large eggs 3/4 cup sugar 1 1/2  tablespoons all-purpose flour 6 tablespoons juice and 2 teaspoon finely grated zest from 2 limes 1 drop (and not a drop more) green...