Not exactly a restauarant suggestion but if you like hot dogs you could try the chilean version, "completo". I have eaten them in many, many places in Chile and my preference is for the completos served in Dominó (Agustinas 1016, downtown Santiago). The space there is limited and you have to eat standing at "la barra", shoulder to shoulder, but it's worth it. Their completos con palta (with avocado) are delicious.