Bloom Gelatin: In a small bowl, whisk gelatin with water and let it sit until needed.
3 tsp gelatin, 3 tbsp water
Boil Milk: Combine milk, vanilla extract, and half the sugar in a pot. Heat until almost boiling.
2 cups milk, 1 teaspoon vanilla extract, 7 tablespoons sugar
Prep Eggs: Whisk egg yolks in a bowl. Mix in cornstarch and remaining sugar.
4 egg yolks, 4 tablespoons cornstarch
Chop Chocolate: Finely chop chocolate and set aside.
4 oz dark chocolate
Temper Eggs: Gradually add hot milk to yolks, whisking constantly to blend without curdling.
Thicken Cream: Return mixture to pot and cook over low/medium heat until thick (2-4 mins), stirring constantly.
Add Chocolate: Off the heat, whisk in chopped chocolate until melted and smooth.
Taste and Adjust: Taste and add sugar if needed.
Add Gelatin: Add bloomed gelatin and whisk until dissolved.
Strain (Optional): Strain if needed to remove unmelted chocolate or any other lumps.
Cover: Cover with plastic wrap and leave at room temperature until it cools to about 100°F (or 40°C).