Blackened Salmon

In a small bowl, whisk together sugar and spices. In a microwave safe bowl, melt 3 tablespoons of butter. Brush butter on tops of fillets and coat with seasonings.  In a large skillet over medium heat, melt remaining 2 tablespoons butter. Add salmon, skin side up and cook 3 minutes, then flip and cook 2 to 3 minutes more or until it flakes easily with a fork. Serve with limes.