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Pre-heat oven to 400°F.
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Butter (or spray with non-stick spray) one side of a large sheet of aluminum foil (double the size needed to hold the salmon fillets in one layer); place in a baking dish (butter side up) large enough to hold the salmon (again, in one layer).
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Fry the finely chopped onion in butter in a frypan until soft and golden but not brown.
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Add the bacon and tarragon and cook for another two minutes.
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Stir in the lemon juice and remove from heat.
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Place the salmon fillets on the foil in the baking dish.
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Cover each fillet with some of the onion/bacon mixture and drizzle any pan juices over as well.
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Fold the foil over the fish and seal to make a parcel.
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Bake for 15-20 minutes, or until fish flakes easily with a fork.
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May be served with a dollops of thick cream or creme fraiche (but I personally don't think it needs it!).