1. Put condensed milk in stove-proof fondue pot over medium-low heat.
Cook, whisking constantly, until it turns light caramel, about 7 minutes.
2. Slowly whisk in evaporated milk. Bring to a simmer, whisking constantly; cook 4 minutes. Remove from heat.
3. Add vanilla, chocolate and salt, and stir until smooth
4. Place fondue pot over warmer, and serve with dippers.