Chard, Cauliflower And Caramelized Onion In Cheese Crust

• Filling for Tart
• 2 pounds cauliflower, cored and cut into small pieces to roast evenly
• 1 bunch chard, stems removed and cut into bite size pieces
• 4 cups onion, about 2 medium, thinly sliced
• 2 garlic cloves, finely minced
• 4 tablespoons olive oil
• 3 tablespoons butter
• 3 eggs, large
• 8 ounces mascarpone cheese
• 1 cup Gruyere cheese, grated
• 3/4 cup Parmesan cheese, grated
• 1/8 teaspoon cayenne pepper
• 1/4 teaspoon nutmeg, ground
• salt
• pepper
• Flaky Tart Crust with Cheese for 10 inch Tart
• 1.5 cups unbleached AP white flour plus more for work surface
• 1/2 teaspoon salt
• 10 tablespoons butter, cold cut into pieces
• 1/3 cup Parmesan cheese, finely grated
• 1/8 teaspoon cayenne pepper
• 1/4 teaspoon nutmeg, ground

1. Preheat oven to 400 degrees F. In glass baking pan with sides, toss cauliflower with 4 tablespoons of olive oil and sprinkle with salt and pepper to taste. If necessary use 2 pans. Roast 15 minutes, turn cauliflower over, then turn oven to 375 and roast another 25 to 30 minutes, checking every 10 minutes, until cauliflower is softened and starting to turn light brown. Set califlower aside.
2. In a thick, wide-bottomed saute pan melt 3 tablespoons of butter and add the onions. Salt to taste. (AntoniaJames added fresth thyme at this point and it sounds wonderful!) Cook the onions over medium low heat (sweating them) stirring about every 20 minutes until the onions are honey colored. Take out 3/4 of the onions and set aside, leaving 1/4 of the onions in the pan.
3. If needed add additional olive oil to 1/4 onions left and saute 2 minced garlic cloves over medium heat. Add chard, 1/8 teaspoon of cayenne, salt and pepper to taste and toss. Put tight fitting lid on pan and cook until chard is soft. Squeeze extra liquid out of chard and set aside.
4. Now we make the sauce. Whisk 3 eggs together in bowl,rnadd 8 ounces mascarpone cheese, 1 cup grated Gruyere cheese, 1/4 teaspoon ground nutmeg, dash of pepper. Stir together and set aside.
5. In food processor pulse flour and salt together. Then add 10 tablespoons of cut butter and pulse for about 10 seconds until mixture looks like corn meal. Add Parmesan cheese, cayenne pepper and nutmeg and pulse several times until mixed.
6. Put dough in medium bowl, add water and using a wooden spoon or spatula gradually gather the mixture into a ball adding water as needed. Make the ball into a disk and wrap in plastic and freeze the dough for 10 minutes or chill it in fridge for 30 minutes.
7. Roll out dough on floured surface and when large enough and about 1/4 " thick place in pie or tart pan, crimp edges and put back in the freezer for 10 minutes.
8. Take dough out of freezer, line it with tin foil or parchment paper, weight the bottom with pie weights or dried beans. Bake at 400 degrees F for 12 minutes. Remove from oven and carefully remove weights and foil or parchment paper. Turn oven to 325 degrees F and bake for another 20 minutes or until done. Take out of oven.
9. Filling the Crustrn1. caramelized onions on bottomrn2. chard on top of onionsrn3. cauliflower on top, broken into bite size piecesrn4. pour sauce over filling rn5. cover the top with 3/4 cup of Parmesan cheese, grated
10. Bake at 350 degrees F for 40 - 45 minutes until tart is bubbling and brown. Transfer to rack and cool 15 minutes before serving.

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Taken from food52.com/recipes/10016-chard-cauliflower-and-caramelized-onion-in-cheese-crust (may not work)