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Cauliflower And Caramelized Onion Tart

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Cauliflower And Caramelized Onion Tart

Ingredients

  • 3 1/2 tablespoons olive oil
  • 1 tablespoon truffle oil or a few pinches of truffle salt (optional)
  • 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
  • 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
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