Cauliflower And Caramelized Onion Tart

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smitten kitchen
Nutrition per serving    (USDA % daily values)
CAL
577
FAT
130%
CHOL
75%
SOD
39%

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Ingredients for 8 servings

1 small head of cauliflower (about 1 pound) or 1 pound of a larger head of cauliflower, cut into 1-inch flowerets (Romanesco cauliflower, especially orange or green, would be a pretty substitute)

3 1/2 tablespoons olive oil

1 tablespoon truffle oil or a few pinches of truffle salt (optional) (see Notes below)

1 refrigerated pie crust or a homemade tart shell (recipe below)

1 large onion, halved lenghtwise and thinly sliced

1 tablespoon Dijon mustard

2 large eggs

1 (7- to 8- ounce) container mascarpone cheese (see Note below for suggested substitutions)

1/2 cup whipping cream (although any low- or full-fat milk or light cream will work as well)

1/4 teaspoon ground white or black pepper

Pinch of ground nutmeg

1 cup grated Gruyère cheese (Swiss or Comté are great swaps)

1/3 cup Parmesan cheese

1 1/4 cups flour

1 tablespoon plus 2 teaspoons cornstarch

1/4 teaspoon salt

6 tablespoons butter, diced

1 egg

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