In a medium bowl whisk together the sweetened condensed milk, cocoa powder, vanilla, and pinch of kosher salt. Whisk well!
Slowly whisk your coffee syrup into the cocoa mixture. It might get sloshy, but keep going! Whisk until well combined.
Using a stand mixer or handheld mixer with a whisk attachment, whip up that heavy cream until it creates stiff peaks.
Gently fold the cocoa and coffee mixture into your whipped cream, only pouring about a quarter of the mixture in at a time. I mean it...be gentle. There's a little extra liquid in this recipe from the syrup so take care not to deflate the cream too much!
When you've got a just a few streaks remaining of unmixed coffee and cocoa, add in about 3/4 of your chocolate chunks. Stir until no streaks remain.
Pour your mixture into a loaf pan (see notes!) and top with remaining chocolate chunks.
Freeze for at least 4-5 hours! Really, the extra liquid from the syrup means it needs a bit longer to set up.
Scoop, serve, enjoy!