INGREDIENTS
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1 tablespoon olive oil
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1 tablespoon butter
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1 small onion, thinly sliced
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16 ounces button mushrooms sliced
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1 tablespoon fresh thyme, chopped
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good pinch of salt and pepper
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1/2 cup white wine
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8 ounces havarti cheese, shredded
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2 sheets thawed frozen puff pastry
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1 egg, beaten
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black and white sesame seeds, for sprinkling