Preheat oven to 350°F (175°C).

In a large bowl, combine flour, instant mashed potatoes, sugar, brown sugar, nuts (if using), and baking soda.

Add melted butter or margarine, grated lemon rind, and eggs to the bowl.

Mix all ingredients until well blended. The mixture will be crumbly.

Form the mixture into 1-inch balls.

Roll each ball in the remaining sugar.

Place the cookies 2 inches apart on an ungreased cookie sheet.

Bake at 350°F (175°C) for 9 to 12 minutes, or until golden brown.

Let the cookies cool for a minute or so before removing them from the cookie sheet.

Transfer to a wire rack to cool completely.