Tantalizing White Onion & Tuna Tart

Tantalizing White Onion & Tuna Tart


  • 2 sheets of ready-made frozen puff pastry, thawed according to instructions
  • 2 generous tbsp butter
  • 3 large white onions, peeled, halved, and sliced thinly
  • 3 large eggs
  • 1 cup cream
  • salt and freshly ground black pepper to taste
  • pinch of freshly ground nutmeg
  • 1/2 cup fresh ground mild flavored cheese, such as gruyere, asiago, or mild cheddar
  • 1 lbs of mildly flavored fish fillets, I used wild tuna, cut into 1/2″ thick chunks

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