Combine the pitted and chopped fresh cherries with 1/3 cup sugar and the brandy. Give it a gentle stir. Pop this mixture into your fridge for at least 12 hours, or up to two days, allowing those lovely cherry flavors to soak up the brandy. When you're ready to proceed, drain the cherries, setting aside any liquid if you wish.
Grab a medium saucepan and combine the heavy cream, whole milk, 2/3 cup sugar, and kosher salt. Cook this mixture over low heat, stirring gently now and then, until all the sugar has completely dissolved, which should take about 4 to 6 minutes. In a separate bowl, whisk together 1/3 cup of your warm cream mixture with the 6 egg yolks until they are fully smooth and blended. Now, very slowly pour the egg yolk mixture back into the saucepan, whisking constantly to temper the yolks. Continue cooking over medium-low heat, stirring constantly, until the mixture just begins to thicken slightly and reaches 170°F on an instant-read thermometer (this usually takes 8 to 10 minutes). Transfer this beautiful custard base to a clean bowl or storage container and let it cool for about 30 minutes. Once cooled, cover it and chill it in the refrigerator for a minimum of 4 hours, or ideally overnight (up to 24 hours). This chilling step is essential for a super smooth and creamy ice cream!
Once your cream base is thoroughly chilled, stir in your delightful brandied cherries. Now, follow the specific instructions for your ice cream maker to churn the mixture. During the very last minute of churning, add in your chopped semisweet dark chocolate chunks for a perfect blend of flavors and textures. Once churned, transfer your freshly made ice cream into a freezer-safe bowl or container and freeze until it's firm enough to scoop and enjoy, which will take at least 2 hours. Get ready for a delicious, romantic treat!