Rinse salmon fillets in very cold water, drain and pat dry. Sprinkle cracked pepper on both sides of fish pressing pepper lightly into the flesh.
Heat a large cast iron or other heavy skillet over medium-high heat. Melt butter; immediately add peppered salmon. Cook fish until edges of each fillet look just opaque, 3 to 5 minutes. Turn fillets, sprinkle with lime juice and salt. Continue cooking until fish is cooked to taste, another 3 to 5 minutes. Garnish with lime wedges; serve immediately.
NOTE: Salmon fillets can also be cooked directly on the grill or in a grill-proof pan or skillet.