In a food processor, combine flour, salt, sugar, butter and vanilla seeds. Pulse until the mixture resembles breadcrumbs. With the motor running, add egg yolks one at a time, then dribble in cold water until the mixture forms a ball.
For individual tarts, divide into six pieces. Flatten into disc(s), wrap in plastic and let rest 1 hour in refrigerator.
Roll out to fit tart mold(s), fill as desired, and bake.