Chop Chocolate: Finely chop the chocolate for easier melting.
Egg Yolk Prep: Separate the yolks from the egg whites; use only the yolks.
Reserve Milk: Set aside half a cup of milk for the starch mixture.
Begin Cooking: Combine remaining milk, egg yolks, sugar, and chocolate in a pot over medium heat. Stir until the chocolate melts.
Starch Slurry: Mix starch with the reserved milk, ensuring no lumps.
Add Slurry: Start stirring the mixture and add the starch mixture to the pot when the milk is almost boiling. Then reduce heat and stir for 1-2 minutes until thickened.
Sweeten to Taste: Adjust sweetness if necessary, tasting carefully.
Serve: Pour into dessert bowl or ramekins. Serve warm or chilled.