There is really only one place in Lagos if you want real burgers ...
"Nah-Nah Bar"
11 Travessa do Forno
Near Praca Da Armas,
Lagos 8600,
Portugal
Speak to Selmo and tell that you were referred by Barlaventoexpert!!
See:
http://www.nahnahbah.com/
http://www.nahnahbah.com/where.html
http://bit.ly/nahnahbartareviews