I reworked a recipe I found on this gorgeous blog http://dinneranddessert.wordpress.com, and her recipe was an alteration of my ice cream hero David Lebovitz recipe.
Being a little lazy in the kitchen, I used whatever ingredients I had. I didn't have the dutch-process cocoa, just some stock standard home brand stuff AND I only had dark cooking chocolate in the cupboard. However, I really like the intense, almost dry flavour I ended up with. The consistency was gorgeous and it tastes awesome with coffee & strawberries.
Dark Chocolate Ice Cream - Philadelphia Style
300ml thickened cream
3 tablespoons unsweetened Dutch-process cocoa powder
1/2 cup sugar
Pinch of salt
1/2 block good quality dark chocolate broken up into pieces (I used 70% cocoa)
1/2 cup whole milk
1 teaspoon vanilla extract
Whisk together the cream, cocoa powder, sugar and salt in a saucepan. Heat the mixture, whisking frequently, until it comes to a full, rolling boil (it will start to foam up). Remove from the heat and whisk in the chocolate until it's melted, then whisk in the milk and vanilla. Pour mixture into a blender and blend for 30 seconds, until very smooth. (I poured into a bowl & stick mixed it for 30 secs)
Chill the mixture thoroughly in the fridge for a few hours (or overnight if you have time) then sling it into your ice cream maker and follow the manufacturer's instructions.