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Onion Tart with Mustard and Fennel

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Onion Tart with Mustard and Fennel

Onion Tart with Mustard and Fennel

amanda

Equipment

  • - Cast Iron Skillet (6-inch)

  • - Digital Food Scale

  • - Silicone Baking Mat

  • - Mixer with Paddle Attachment (Stand Mixer)

  • - Pastry Cutter Set

  • - Pie Pans with Retained Heat (Convection)

  • - Bench Scraper

  • - Fennel Grater

  • - Chef's Knife

  • - Digital Kitchen Timer

  • - Pie Server with Spiral Cut

Ingredients

  • 2 1/4 teaspoons active dry yeast (a 1/4-ounce package)

  • 1/2 cup warm water (105-115°F)

  • 1 1/2 to 1 3/4 cups all-purpose flour

  • 1 large egg

  • 1/3 cup plus 1 tablespoon extra-virgin olive oil, divided

  • 2 1/2 teaspoons salt, divided

  • 2 teaspoons fennel seeds

  • 3 pound yellow onions, halved and thinly sliced

  • 1 tablespoon Dijon mustard

  • 1/2 cup grated Parmigiano-Reggiano

Instructions

1

Instruction 1

Stir together yeast and warm water in a small bowl and let stand until foamy, about 5 minutes. (If mixture doesn't foam, start over with new yeast.)
2

Instruction 2

Put 1 1/2 cups flour in a medium bowl, then make a well in center of flour and add yeast mixture to well. Stir together egg, 1 tablespoon oil, and 1 1/2 teaspoons salt with a fork. Add egg mixture to yeast mixture and mix with a wooden spoon or your fingertips, gradually incorporating flour, until a soft dough forms. Transfer dough to a floured surface and knead, working in additional flour (up to 1/4 cup) as necessary, until smooth and elastic, about 5 minutes. Transfer dough to an oiled bowl and turn to coat. Cover with plastic wrap and let rise in a draft-free place at warm room temperature until doubled, 1 to 1 1/2 hours.
3

Instruction 3

While dough rises, heat remaining 1/3 cup oil in a 12-inch heavy skillet over medium-high heat until it shimmers, then sauté fennel seeds until a shade darker, about 30 seconds. Stir in onions, remaining teaspoon salt, and 1/2 teaspoon pepper, then reduce heat to medium-low and cover onions directly with a round of parchment paper. Cook, stirring occasionally, until onions are very tender and golden brown, 1 to 1 1/4 hours.
4

Instruction 4

Preheat oven to 375°F with rack in middle.
5

Instruction 5

Knead dough gently on a floured surface with floured hands to deflate. Pat out dough on a large heavy baking sheet (preferably blue steel) into a 15- by 12-inch rectangle, turning up or crimping edge, then brush mustard evenly over dough, leaving a 1/2-inch border around edge. Spread onions evenly over mustard, then sprinkle evenly with cheese.
6

Instruction 6

Bake tart until crust is golden brown, 30 to 35 minutes. Cut into 2-inch squares or diamonds and serve warm or at room temperature.
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