01 - In a medium saucepan over low heat, combine the heavy cream and butter. Warm gently until the butter melts and the mixture just begins to simmer, avoiding boiling.
02 - Remove from heat and immediately add the chopped dark and milk chocolate. Let sit for one minute to soften.
03 - Stir gently until the chocolate is completely melted and the mixture is smooth.
04 - Stir in the vanilla extract and a pinch of sea salt.
05 - Pour the chocolate mixture into a fondue pot or heatproof bowl set over a tea light or low flame to maintain warmth and fluidity.
06 - Arrange your selected fruits, marshmallows, and cake cubes on a serving platter.
07 - Using fondue forks or skewers, dip dippers into the warm chocolate and enjoy immediately.