If you can't get to South America's chocolate capital Bariloche, you'll find some of the best sweets in Argentina at this boutique/café in the center of town. Planks of homemade chocolate include coconut crunches, fudges, and brittles, along with Tierra del Fuego's best selection of artisanal beers, chutneys, and spices. In the small coffee shop at the back, drop a glorious slab of dark chocolate into a mug of piping hot milk—one of the best submarinos in town.
Locals pop in for a quick cup of hot chocolate at all hours, even as other cafés close for the lull between 3 and 8 in the evening. If you get hooked, there's another branch on the main street of El Calafate.