Place the chocolate in a large bowl, and set aside. Have a large sieve at the ready.
Step 2
In a medium-sized heavy saucepan, such as a Dutch oven, whisk the egg yolks and sugar until combined.Whisk in the milk and cream, and heat over medium-low, whisking constantly, until the mixture has thickened. It should not bubble or boil, and will coat the back of a spoon.
Step 3
Pour the thickened egg yolk mixture through the sieve over the chocolate and stir; the chocolate will melt. Add the butter, ¼ teaspoon Maldon salt, and the cardamom, cinnamon, espresso powder, and vanilla.
Step 4
Divide the mixture into small serving dishes or one medium-sized serving dish and refrigerate until set. This will take at least 4 hours.
Step 5
When ready to serve, top with whipped cream and sprinkle with Maldon salt.