Cut the salmon into 6 equal serving pieces, wash and pat dry on paper towels. Melt the butter in a large skillet over medium-high heat. Sear the salmon on each side for about 2 to 3 minutes, keeping the center slightly rare since the fish will continue to cook after it is taken from the pan. Remove the fish from the pan with a slotted spatula and keep warm. Reduce the heat to low and add the shallots and garlic to the pan.