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CARAMELIZED ONION & ROASTED CAULIFLOWER TART




Cauliflower is amazing when roasted with olive oil, garlic & S & P.      Cauliflower itself is packed with vitamins and antioxidants.  If you’re looking for ways to incorporate healthy veggies into your diet, this is one meal that does so perfectly – plus it’s vegetarian, so a bit more accessible to those with dietary restrictions.
Though this recipe calls for Gruyere, you can substitute Swiss cheese or a combo of fontina and Parmesan. If you want it to be a touch lighter, swap out mascarpone for a reduced-fat sour cream. 

Adapted, barely, from Smitten Kitchen (adapted from Bon Appétit)
1 homemade tart shell (recipe below) or you can use a refrigerated pie crust
1 large head cauliflower (about 1 lb.)
1 large yellow onion
1 8 oz. package mascarpone cheese (or sour cream to make it lighter)
1 cup grated Gruyère
2 tablespoons grated parmesan
1/2 cup heavy cream
2 large eggs
truffle oil
olive oil
dijon mustard
pinch of ground nutmeg
salt & pepper
Preheat the oven to 425°F.
Remove the stem and outer leaves from the cauliflower, and cut into florets. Place on a rimmed baking sheet, and toss with a little olive oil (about 1-2 tablespoons), salt, and pepper (to taste). Roast, tossing occasionally with a spatula, until just starting to turn golden at the edges—about 20 minutes. Remove from oven, and set aside to cool. Reduce the oven temperature to 350°F. Once the roasted cauliflower is cooled, thinly slice the florets (about 1/4 inch thick), and toss with a light drizzle of truffle oil. Set aside until you’re ready to assemble the tart.
While the cauliflower is roasting, caramelize the onion. Halve the onion, then thinly slice. In a large pan over medium-high heat, heat a couple splashes of olive oil. Add the onion, along with a little salt and pepper. Cook (stirring occasionally) for about 7 minutes, until the onion is translucent and just beginning to turn golden. Reduce the heat to low, and cook (stirring occasionally) until the onions are a deep golden color and caramelized, about 20 minutes. Once done, set aside until you’re ready to assemble the tart.
While you’re waiting on the onions and the cauliflower, mix together the eggs, mascarpone, and cream—along with salt and pepper, to taste. Next, add in the Gruyère, and stir to combine. Set aside.
Now you’re ready to assemble the tart. Place the pastry shell on a rimmed backing sheet, to catch any drips. Using a pastry brush, coat the bottom of the pastry shell (recipe below) with dijon mustard. Use a light touch here—the dijon mustard layer should only be about an 1/8 inch thick. Next, spread the caramelized onions evenly across the bottom of the pastry shell, and then top with the roasted cauliflower. Pour the mascarpone and cream mixture over caramelized onions and roasted cauliflower. Finally, sprinkle the top of the tart with 2 tablespoons grated parmesan. Place the tart (still on the rimmed baking sheet) in the oven. Bake until the tart is a lovely golden color, and the center is set—about 40 minutes. Remove from the oven, and cool on a wire rack for 15 minutes before serving.
SAVORY TART SHELL
From Smitten Kitchen (adapted from Le Pain Quotidien)
1 1/4 cups flour
1 tablespoon plus 2 teaspoons cornstarch
1/4 teaspoon salt
6 tablespoons butter, diced
1 egg
Combine the dry ingredients in a large bowl. Using a pastry blender (or two forks), cut the butter into the flour mixture, until it resembles small peas (see photo). Next, add the egg, and mix everything together with a fork, until a dough begins to form. At this point, the mixture will still be loose and very floury. To make it come together, get your hands in the bowl, and knead it together until it forms a smooth ball (see photo).
Next, on a lightly floured surface, roll out the dough to a 12-inch circle. Fold the dough in half, then in half again. Gently pick it up, and place in a 9-inch tart pan and unfold (folding the dough is simply an easy technique for transporting the dough to the pan without damaging it). Press the dough into the fluted edge of the pan, and trim the edges with a paring knife. Refrigerate for at least 30 minutes.* No parbaking needed!
* Make the dough before you start cooking the ingredients for the tart. By the time the cauliflower is roasted and the onions are caramelized, the tart will be ready for the oven as well.

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