Sauté seasonings and garlic in butter in a large heavy skillet over medium heat 1 minute. Reduce heat to low; add fish. Cook fish 4 minutes; turn and cook an additional 3 -4 minutes or until fish flakes easily when tested with fork (do not overcook). Remove fish with a slotted turner; place on heated platter, and keep warm. Pour sherry into skillet; cook over high heat 30-45 seconds. Pour sherry mix over fish; serve immediately.