Cook the salmon. Pat the salmon dry with paper towels.
Season liberally with salt and pepper.
Heat a pan over medium-high heat. Once hot, add the oil. When the oil is just shimmering, add the fish skin-side down and cook for 3 to 4 minutes, until the skin is lightly browned, crisp, and lifts from the pan easily.
Flip the salmon. Cook on the remaining side for 3 to 4 minutes, until the interior temperature reads 125 degrees Fahrenheit for medium-rare. For medium, continue cooking for another minute, or until the internal temperature reads 145 degrees Fahrenheit.
Once the fish has reached 125 degrees Fahrenheit and flakes easily with a fork, remove the salmon from the pan.
Top the cooked salmon with pineapple salsa to taste and serve!