Salt and pepper all sides of the cod fillets. Set aside.
Remove stems from strawberries and chop them to the size of your liking, I like rough bigger pieces.
Combine strawberries, onion, serrano peppers, cilantro and lime juice. Set aside.
Put one tablespoon of butter in a large skillet and let it melt over medium-hight heat. Place two cod steaks in it and cook for 5-6 minutes on each side or until it reaches an internal temperature of 145 degrees Fahrenheit and flakes easily.
Take them out of the skillet and repeat with butter and 2 other fish steaks.
Right before serving, salt the strawberry salsa to taste. Cover each cod fillet with a generous portion of the strawberry salsa.