Mix the flour and the sugar in the bowl of an electric mixer or food processor. Cut or process in the butter with short pulses until the mixture resembles cornmeal. Whisk together the yolk, cream, and vanilla in a small bowl and add to the dough mixture. Mix or process in with short pulses until the dough just comes together. Gather the dough into a ball, flatten into a disk, and wrap in plastic wrap. Refrigerate 1 hour.
© 1992 Joyce Goldstein. All rights reserved.