In a medium sized mixing bowl, beat together butter, sugar and vanilla extract until light and fluffy. Then add flour and pecans (toasted and chopped) and beat until the mixture comes together. Initially it will look as if the dough is never going to come together, but after 30 seconds of continuous beating, it will come together. If it absolutely doesn’t come together, then dribble in 1tablespoon water, until it does. This is a stiff dough.