Cornmeal Tart Shell: 2 1/4 cups all-purpose flour 1 cup spelt flour scant 1 cup medium coarse corn meal 3/4 teaspoon fine grain salt 1 1/4 cups unsalted butter, cut in cubes 1 large egg yolk 1/4 to 3/4 cup cold water
Turnip Green Filling:
1/4 lb. turnip greens, de-stemmed 2 to 3 tablespoons chopped green garlic 2 large eggs + 1 yolk 3/4 cup vegetable broth 1/4 cup heavy cream scant 1/4 teaspoon salt (more if broth unsalted) 2 teaspoons Dijon-style mustard 1 1/2 teaspoons herbs de Provence (optional) Gruyere cheese & a bit of crushed red pepper flakes, for topping
special equipment: tart pans - 9-inch (23 cm) round, 8 x 11 inch (20 x 28) rectangle, or equivalent
Start by making the tart dough. Combine flours, cornmeal, and salt in food processor. Pulse in butter, 20+ pulses, or until the mixture resembles sandy pebbles on a beach. Add the egg yolk and 1/4 cup water. Pulse, trickle in more water if needed, just until dough comes together. Turn out onto a floured countertop and gather into a ball. Divide the dough into two equal pieces, shape each into a ball, press into 1/2-inch thick disks, and wrap in plastic, or place in baggies. Chill for at least an hour. (This dough recipes makes enough for two tart shells. You can always freeze the extra dough or shell for use later in the week/month. They seem to keep fine in the freezer, well wrapped, for a few weeks, but not much longer than that.)
Preheat the oven to 350 degrees. Place a rack in the middle of the oven.
When you're ready to line the tart pans with dough, place one of the dough disks on a lightly floured surface and roll out until the dough is large enough to line your tart pan. I usually eyeball it - the dough is about 1/6 - 1/8 inch thick. Dust underneath with flour to discourage sticking throughout the rolling process. Carefully transfer the dough to the pan. Don't worry too much if you get a tear or hole, you can patch those up later with scraps. Work quickly to ease the dough into place, taking care not to stretch the dough. Press it along the bottom of the pan, out to the walls, and against the sides. Trim any excess dough - I use the palm of my hand against the edge of the tart pan to cut off any extra dough, alternately you can roll a rolling pin across the rim of the pan for a clean edge. Chill in the refrigerator for thirty minutes or so while you roll out your extra tart shell. Double wrap that one in plastic and freeze it for future use.
You're going to partially bake the tart shell before filling it, so pull the shell out of the refrigerator, dock it with a fork, making small holes along the bottom of the shell. Line the shell with parchment paper and fill to the rim with pie weights or dried beans, bake for 25 minutes. Carefully remove the pie weights and finish baking for another 5 minutes, or until the crust is dry and just barely starting to brown. Remove from oven and let cool completely.
To make the filling: Chop the turnip greens and green garlic in a food processor. You can do this by hand as well, but in this case the processor makes quick work of this. Add the eggs and yolk, pulse. Then the broth and cream. Lastly, incorporate the salt, mustard, and herbs. When you're ready to bake, fill the tart shell and bake for 30 minutes or so, or until the center is set, and has firmed up to the touch. About 2/3 of the way through I like to sprinkle with a bit of Gruyere cheese. I can't help but zap the top of most tarts under the broiler for a minute or two just prior to pulling it out of the oven - it browns up the top nicely, and lends a rustic look to it. Finish with a sprinkling of crushed red pepper flakes if you don't mind a bit of heat.