In a medium heavy-bottomed saucepan, warm the milk, curry powder, and cardamom pods over medium heat, stirring every now and then so it doesn't burn.
Meanwhile, spoon the cocoa powder into a measuring cup. Once you see little bubbles forming around the perimeter of the saucepan, the milk is hot; turn off the heat. Pour a little milk, about 1 cup, into the cocoa powder, and whisk until smooth. Add back to the saucepan, and whisk in the honey and salt. Stir until well combined.
Pour the hot chocolate through a strainer into 4 individual mugs and top with marshmallows, if you like.