INGREDIENTS
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Tarte:
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250g plain flour (8.8 oz)
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125g cold unsalted butter, diced (4.4 oz)
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1 teaspoon salt
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1 egg
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Onion filling:
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60g unsalted butter (2 oz)
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600g (about 2 large) onions, cut in half then thinly sliced (21 oz)
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3 eggs, beaten
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200ml crème fraîche*
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½ teaspoon freshly grated nutmeg
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salt and freshly ground black pepper