INGREDIENTS
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1 teaspoon vegetable oil for frying
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2 red onions, chopped
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8 cups fresh spinach
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salt and freshly ground black pepper
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1 pinch ground nutmeg
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9 ounces fresh ricotta cheese
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1 tablespoon grated Parmesan cheese
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1 sheet frozen puff pastry, thawed
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1 egg, beaten
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4 multi-colored cherry tomatoes, halved, or more to taste