Place a cast iron skillet under a pre-heated broiler for ten minutes.
Remove the pan from the oven and put the salmon fillet skin-side down on the heated cast iron pan.
Pour olive oil on top of the salmon and season it with red pepper flakes, dry parsley, salt, and pepper.
Place the cast iron back in the oven on high broil and cook for about 8 or 10 minutes.
Before serving the salmon, top with a squeeze of fresh lemon juice.
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