01 - Place the chopped dark chocolate in a heatproof bowl.
02 - Warm the heavy cream in a small saucepan over medium heat until it just begins to simmer without boiling.
03 - Pour the hot cream over the chocolate and let it sit for 2 minutes to allow melting.
04 - Gently stir the mixture with a spatula until smooth and glossy.
05 - If desired, incorporate the unsalted butter, vanilla extract, and sea salt until fully blended.
06 - Use immediately for glazing or pouring, or chill at room temperature or in the refrigerator for thicker consistency suitable for truffles or piping.