Summer Berry Mint Cream Tart

In a bowl with an electric mixer cream the butter with the sugar, the salt, and the vanilla, add the flour, and blend the mixture until it forms crumbs that become a dough when pressed together. Turn the crumbs into a buttered 10-inch tart pan with a removable fluted rim, press them firmly onto the bottom and up the side of the pan, and chill the shell for 30 minutes. Prick the shell all over with a form, line it with foil, and fill the foil with the rice. Bake the shell in the lower third of a preheated 375 °F. oven for 15 minutes, remove the rice and the foil carefully, and bake the shell for 10 minutes more, or until it is golden. Let the shell cool in the pan on a rack for 5 minutes, remove the side of the pan, and let the shell cool completely. (The shell will be very crisp and cookie-like.)