Cheese and Tomato Galette

To make crust, in bowl of mixer fitted with paddle attachment, mix the flour, sugar and salt on low speed. Ad cold butter and mix on low speed til it looks pebbly In small bowl, mix yolks and sour cream. Pour this into mixer bowl and mix on low speed til dough almost comes together and no flour remains at the bottom of the bowl. Turn dough out onto a work surface and form it into a disk. Wrap it in plastic wrap and refrigerate it for at least 1 hour. On floured work surface, roll dough out 1/8 inch thick. Line a 4 cup capacity ceramic flan pan or quiche dish with dough, trimming off any excess. Chill dough in pan while you make the filling. Heat oven to 375. To make filling, whisk together eggs, cream and milk in a bowl til smooth. Stir in three types of cheese, the bacon if using and the parsley, chives, nutmeg and Tabasco. Pour filling into tart shell and then lay the tomato slices on top of the filling. Distribute them evenly. Bake for 60 to 70 minutes, checking for doneness by sticking a knife into the custard; the knife should come out clean. Serve hot or at room temperature, cut into wedges. Serves 6 to 8