Cream butter and sugar until soft, then stir in lemon juice.

Add flour and mix well.

Mix in nuts and lemon zest, and roll into 1-inch balls.

Place balls on ungreased baking sheet, and bake at 350 degrees for 15 to 18 minutes or until slightly brown at the bottom.

Let cool slightly, then roll in powdered sugar, and place on baking sheet until completely cool.

Roll once more in powdered sugar, then store in air-tight container.