In a medium skillet, heat sesame oil until very hot. Place salmon in pan, skin-side up, and cook until lightly browned, about 1½ minutes. Turn fillets over and sprinkle with sesame seeds. Add tamari, toasted sesame oil, and water to pan. Cover and cook over medium heat for 7-10 minutes, until just cooked through, adding more water if needed. Remove from pan, arrange on serving plates, and drizzle with sauce. Serve immediately.