Cream butter and first amount of sugar well. Beat in egg. Mix in molasses.
Stir flour, baking soda, ginger, cinnamon and salt together and add. Mix well. Shape into 1 inch (2.5 cm) balls.
Roll in sugar and place on greased baking sheet. Bake in 350°F (180°C) oven for 10 to 12 minutes. Makes 6 dozen.