01 - Set oven temperature to 325°F.
02 - In a saucepan, warm the milk and heavy cream over medium heat until steaming but not boiling.
03 - Remove the saucepan from heat, add chopped dark chocolate, and stir until fully melted and smooth.
04 - Whisk together eggs, sugar, vanilla extract, and salt until evenly blended.
05 - Gradually pour the warm chocolate mixture into the egg mixture, whisking continuously to avoid curdling.
06 - Pass the combined mixture through a fine mesh sieve into a large container to ensure smooth texture.
07 - Distribute the strained mixture evenly among four ramekins.
08 - Place ramekins in a deep baking dish and pour hot water until halfway up the sides of the ramekins.
09 - Bake for 20 minutes until custards are set but slightly wobbly in the center.
10 - Remove ramekins from water bath and allow to cool to room temperature.
11 - Refrigerate custards for at least one hour prior to serving.