By Thomas Keller
This tart is best served at room temperature, within a few hours of assembling, but if necessary, it can be refrigerated and served cold.
Preheat the oven to 350°F. Generously butter and flour a 9-inch fluted tart pan with a removable bottom and refrigerate it while the oven preheats.
Remove the tart pan from the refrigerator. Use your fingertips to press the ch