Butter Cookies

This is my Aunt Sheryl's recipe...it's a FAVORITE, and I usually double this!

Butter Cookies
2 sticks butter (soft)
3/4 c. sugar
1/2 t. vinegar
1/2 t. vanilla
1 1/2 c. flour
1/2 t. baking soda

Cream butter and sugar. Add vinegar and vanilla. Add flour and baking soda. (Add a little more flour if cookie dough is too sticky). Roll dough into small balls and roll in sugar. Place on ungreased cookie sheets and bake at 300 degrees for about 18 minutes.