Spray a large cast-iron skillet or stainless steel skillet with nonstick cooking spray and heat it over medium-high heat.

When the pan is hot, add half of the butter, and let it melt.

The pan should be hot enough that the butter bubbles but doesnt brown.

Add in the salmon, skin side down and top it with half the lime juice and half of the salt.

Sear the salmon (cook it without moving it) for about 5 minutes until it starts to cook through.

Add the remaining half of the butter to the pan and flip the salmon.

Decrease the heat slightly; top the salmon with the rest of the lime juice and a little more salt.

Cook it for 3-5 minutes until the salmon flakes easily and is cooked through.

Remove the salmon to a plate and top it with any pan drippings.