This sweet green tomato pie--also sometimes called mock apple pie--is a great way to make use of extras from a bumper crop of tomatoes. Be sure to select firm, green unripe tomatoes for this pie; there are heirloom tomatoes that are green when ripe--those would turn to mush in this pie, which is not the result you want. Served on its own or with a dollop of whipped cream, this summer dessert is sure to impress.